Liên hệ bộ phận chăm sóc khách hàng.

A natural word-by-word breakdown is:

• liên hệ = to contact, to get in touch with
• bộ phận = department, section, division
• chăm sóc = to take care of, care for
• khách hàng = customer

So bộ phận chăm sóc khách hàng literally means the department that takes care of customers, or more naturally, customer service / customer care department.

The whole sentence means: Contact customer service.

Vietnamese often leaves out the subject when it is obvious from context, especially in:

• instructions
• signs
• announcements
• commands

So Liên hệ bộ phận chăm sóc khách hàng is like an instruction:

• (You should) contact customer service.

English usually needs the implied you in the imperative, but Vietnamese does not.

Yes. It is an imperative sentence, meaning it tells someone what to do.

Liên hệ bộ phận chăm sóc khách hàng.
= Contact customer service.

Depending on context, it can sound like:

• a direct instruction
• a recommendation
• a formal notice

If you want to make it softer or more polite, Vietnamese often adds vui lòng:

• Vui lòng liên hệ bộ phận chăm sóc khách hàng.
  = Please contact customer service.

Because liên hệ is the main verb, and standard Vietnamese word order is usually:

Verb + object

So here:

• liên hệ = contact
• bộ phận chăm sóc khách hàng = customer service department

That gives:

• Liên hệ bộ phận chăm sóc khách hàng.
• literally: Contact customer-service department.

This is normal Vietnamese word order.

Yes, liên hệ can be both:

1. a verb: to contact / to get in touch with
2. a noun: connection / relation

In this sentence, it is clearly a verb because it comes first and is followed by the thing/person being contacted.

Examples:

• Tôi sẽ liên hệ với bạn.
  = I will contact you.

• Hai vấn đề này có liên hệ với nhau.
  = These two issues are related to each other.

So context tells you which meaning is intended.

You will often see both patterns:

• liên hệ bộ phận chăm sóc khách hàng
• liên hệ với bộ phận chăm sóc khách hàng

Both can mean contact customer service.

A useful way to think about it:

• liên hệ với ... is more explicit: contact/get in touch with ...
• omitting với is common in short instructions, notices, and business-style language

So this sentence without với is completely natural, especially in formal written instructions.

Literally, it is:

• bộ phận = department
• chăm sóc khách hàng = caring for customers

So the whole phrase is: department for customer care

In natural English, that becomes:

• customer service department
• customer care department

This is a very common Vietnamese business phrase.

Because in Vietnamese, the main noun usually comes first, and words that describe it come after it.

So:

• bộ phận = department
• chăm sóc khách hàng = customer care

Together:

• bộ phận chăm sóc khách hàng
  = customer care department

This is different from English, where modifiers often come before the noun:

• customer service department

In Vietnamese, it is more like:

• department [for] customer service

Here, chăm sóc khách hàng functions as a descriptive phrase modifying bộ phận.

It is not being used as a separate full sentence. Instead, it tells you what kind of department it is.

You can think of it like this:

• bộ phận = department
• bộ phận nào? = which department?
• bộ phận chăm sóc khách hàng = the customer-service department

So the phrase after bộ phận narrows down which department is meant.

• khách = guest, visitor, customer (general, depending on context)
• khách hàng = customer, client, purchaser

In business contexts, khách hàng is the standard word for customer.

So chăm sóc khách hàng is the normal expression for customer care / customer service.

Using just khách here would sound less precise.

It sounds neutral to formal.

It is very natural in contexts like:

• websites
• product packaging
• customer support instructions
• public notices
• business communication

By itself, it is not rude, but it is fairly direct because it is an instruction.

To make it more polite, add vui lòng:

• Vui lòng liên hệ bộ phận chăm sóc khách hàng.
  = Please contact customer service.

To make it sound more conversational when speaking to a person, you might add a pronoun or title:

• Anh/chị vui lòng liên hệ bộ phận chăm sóc khách hàng.
  = Please contact customer service.

Yes, but by itself it sounds a bit like a written instruction or business notice.

In conversation, speakers often soften it by adding:

• vui lòng = please
• a pronoun or respectful form of address, such as anh/chị

For example:

• Anh/chị vui lòng liên hệ bộ phận chăm sóc khách hàng.
• Bạn nên liên hệ bộ phận chăm sóc khách hàng.

These feel more natural in spoken interaction.

So the original sentence is correct, but it is especially common in formal or written settings.

A rough pronunciation guide:

• liên hệ ≈ lee-en hay
• bộ phận ≈ boh fuhn
• chăm sóc ≈ chum sawk
• khách hàng ≈ khak hahng

But the tones are very important in Vietnamese, so a rough English approximation only goes so far.

Tone notes:

• liên has a level tone
• hệ has a heavy/falling-glottal tone
• bộ has a heavy/falling-glottal tone
• phận has a heavy/falling-glottal tone
• chăm has a level tone
• sóc has a rising/sharp tone
• khách has a sharp tone
• hàng has a falling tone

If you are learning pronunciation, this sentence is a good example of how important tones are in business vocabulary.

Yes. Depending on style and context, you might also see:

• Vui lòng liên hệ bộ phận chăm sóc khách hàng.
  = Please contact customer service.

• Hãy liên hệ với bộ phận chăm sóc khách hàng.
  = Please / Do contact customer service.

• Xin liên hệ bộ phận chăm sóc khách hàng.
  = Please contact customer service.
  (more formal)

• Liên hệ với tổng đài chăm sóc khách hàng.
  = Contact the customer service hotline/call center.

So the original sentence is one very common and standard way to say it.