Tôi kê khai địa chỉ trong đơn đề nghị.

Kê khai is a fairly formal/administrative verb. It means something like:

• to declare
• to state officially
• to fill in/provide information on a form

In this sentence, it suggests that the speaker is officially entering or declaring an address in a document, not just casually saying it.

So compared with everyday English, kê khai is closer to declare/provide information on a form than to a casual write down.

Vietnamese often leaves out possessives like my, your, his, etc. when they are obvious from context.

So Tôi kê khai địa chỉ... naturally implies:

• I declare my address...
• or simply I provide the address...

If needed, Vietnamese can make it explicit:

• địa chỉ của tôi = my address

But in a sentence like this, that would often sound unnecessary unless you need contrast or emphasis.

Đơn đề nghị is a formal written request/application.

A rough word-by-word breakdown is:

• đơn = form, application, written petition
• đề nghị = request, proposal, to request

Together, đơn đề nghị means a document used to request something officially.

Depending on context, it could be translated as:

• request form
• application
• written request
• petition

It is more formal than just tờ giấy or form in casual speech.

Trong usually means in or inside.

In this sentence, trong đơn đề nghị means:

• in the application
• in the request form
• within the written request

It marks the place where the information appears.

A learner might expect something like on the form because English often says on a form, but Vietnamese commonly uses trong for information contained within a document.

The basic structure is:

• Tôi = subject
• kê khai = verb
• địa chỉ = object
• trong đơn đề nghị = prepositional phrase showing where/in what document

So it works like:

I + declare/provide + address + in the application

Vietnamese word order here is quite straightforward: Subject + Verb + Object + Location/Context phrase.

It is understandable and appropriate in a formal administrative context. However, depending on context, native speakers might also say:

• Tôi ghi địa chỉ trong đơn đề nghị.
  = I write the address in the application.
• Tôi điền địa chỉ vào đơn đề nghị.
  = I fill in the address on the form.
• Tôi khai địa chỉ trong đơn.
  = I declare/provide the address in the form.

The original sentence sounds especially suitable when talking about officially declaring personal information.

These words overlap, but they are not identical.

• kê khai: formal, administrative, often used for listing or declaring information officially
  Example contexts: taxes, assets, personal details, forms

• khai báo: to report or declare to an authority
  Example contexts: customs declaration, health declaration, temporary residence reporting

• khai: a shorter, common verb meaning to declare/provide required information
  Very common in form-related language

• điền: to fill in
  Focuses more on the physical act of writing information into blanks on a form

So if you want the most formal/official feel, kê khai works well. If you want to emphasize simply filling in a form, điền is often the most natural.

Yes, grammatically it could. Vietnamese does not automatically force địa chỉ to mean my address.

The sentence only tells us:

• I declared an address in the application

In real context, people would usually assume it is the speaker’s address, because that is the most normal thing to provide on a form. But if needed, Vietnamese can specify:

• địa chỉ của tôi = my address
• địa chỉ của công ty = the company’s address
• địa chỉ của người bảo lãnh = the sponsor’s address

So the exact owner of the address depends on context unless explicitly stated.

Vietnamese does not have articles that work like English a/an/the.

So:

• địa chỉ can mean an address, the address, or just address
• đơn đề nghị can mean a request form, the application, etc.

Context tells you which interpretation is correct.

This is very common in Vietnamese. English learners of Vietnamese often want every noun to be marked for definiteness, but Vietnamese usually leaves that unstated.

Sometimes yes, but it depends on context.

If it is already clear who is speaking, Vietnamese often drops subjects. For example, in a conversation about what you wrote on a form, someone might simply say:

• Kê khai địa chỉ trong đơn đề nghị rồi.

However, when giving a full standalone sentence, especially in writing or careful speech, Tôi is perfectly natural and clear.

So:

• Tôi kê khai địa chỉ trong đơn đề nghị. = full and explicit
• Kê khai địa chỉ trong đơn đề nghị. = possible only if context already makes the subject clear, or it may sound like an instruction

It is definitely more formal than everyday conversation.

Clues:

• kê khai is administrative/formal vocabulary
• đơn đề nghị is official document language

In everyday life, people might choose simpler verbs like:

• ghi = write
• điền = fill in

So if you are talking to a friend casually, the sentence may sound a bit official. But in government, legal, workplace, or paperwork contexts, it fits well.

They are similar, but not exactly the same in focus.

• trong đơn đề nghị = in the application
  Focuses on the location/context of the information
• vào đơn đề nghị = into the application/form
  Focuses more on the action of putting/filling information into the form

So:

• Tôi kê khai địa chỉ trong đơn đề nghị.
  sounds like the address is stated in that document
• Tôi điền địa chỉ vào đơn đề nghị.
  sounds like I filled the address into the form

Both can be natural, but the verb often affects which preposition sounds best. Điền ... vào ... is especially common.

A rough breakdown is:

• Tôi — level-ish falling diphthong, often approximated as toy
• kê — mid-level
• khai — high or fairly level depending on dialect, like khai
• địa — heavy/glottalized falling tone on địa
• chỉ — rising tone
• trong — level
• đơn — level
• đề — falling tone
• nghị — heavy/glottalized tone

A rough learner-friendly pronunciation guide:

toy kay khai dee-uh chee trong dun day nghee

But the tones matter a lot, especially in:

• chỉ
• đề
• nghị
• địa

If you want, the safest approach is to learn it in chunks:

• Tôi kê khai
• địa chỉ
• trong đơn đề nghị

That usually makes pronunciation easier than reading word by word.