Tình nguyện viên khử trùng dụng cụ vệ sinh.

It follows the very common Vietnamese pattern:

• Subject + Verb + Object

So in this sentence:

• Tình nguyện viên = subject
• khử trùng = verb
• dụng cụ vệ sinh = object

A natural breakdown is:

• Tình nguyện viên = volunteer(s)
• khử trùng = disinfect
• dụng cụ vệ sinh = cleaning/sanitation equipment or hygiene tools

So the sentence is structured very similarly to English: Volunteers disinfect sanitation equipment / The volunteer disinfects the cleaning tools.

It is written as three separate written units, but it functions together as one noun phrase meaning volunteer.

Breakdown:

• tình nguyện = voluntary, volunteer work
• viên = person/member/agent suffix in many compounds

Together, tình nguyện viên means volunteer.

This is very common in Vietnamese: something written as multiple syllable-blocks can still act as a single lexical item.

Khử trùng means to disinfect or to sterilize, depending on context.

Breakdown:

• khử = remove, eliminate
• trùng here relates to germs/microorganisms in this compound

So khử trùng literally gives the idea of eliminating germs.

In everyday use, it often corresponds to:

• disinfect
• sometimes sterilize
• sometimes sanitize, depending on the situation

Because many Vietnamese verbs are made of two syllables written separately but functioning as one lexical verb.

So khử trùng is best learned as a single verb meaning to disinfect.

This is normal in Vietnamese. Other common examples are things like:

• học tập
• làm việc
• chuẩn bị

Even though they are written with spaces, they often function like single vocabulary items.

It most likely means cleaning tools, sanitation equipment, or hygiene equipment, depending on context.

Breakdown:

• dụng cụ = tools, instruments, equipment
• vệ sinh = hygiene, sanitation, cleaning

So dụng cụ vệ sinh is a noun phrase where vệ sinh describes what kind of equipment it is.

Possible natural translations include:

• cleaning tools
• sanitation equipment
• hygiene equipment
• cleaning supplies (in some contexts)

The exact English choice depends on the situation.

Here, vệ sinh is functioning like a modifier for dụng cụ.

On its own, vệ sinh can have several related uses:

• noun: hygiene, sanitation
• verb: to clean, to do cleaning
• in combinations, it can modify another noun

In dụng cụ vệ sinh, it describes the type of equipment:

• equipment for cleaning/sanitation
• hygiene equipment

So here it is not the main verb of the sentence. The main verb is khử trùng.

You usually do not know from the noun alone.

Vietnamese nouns often do not mark singular vs. plural unless something in the sentence makes it clear.

So tình nguyện viên can mean:

• the volunteer
• a volunteer
• volunteers

Context decides.

If the speaker wanted to make plural clearer, they might say:

• các tình nguyện viên = the volunteers / volunteers

If they wanted a single counted volunteer:

• một tình nguyện viên = one volunteer / a volunteer

By itself, the sentence has no explicit tense marking.

Vietnamese often leaves tense unstated when context is enough. So this sentence could mean:

• The volunteer disinfects the equipment
• The volunteer is disinfecting the equipment
• The volunteer disinfected the equipment

depending on context.

If the speaker wanted to make time clearer, they could add markers such as:

• đã = past
• đang = ongoing
• sẽ = future

For example:

• Tình nguyện viên đang khử trùng dụng cụ vệ sinh. = The volunteer is disinfecting the cleaning equipment.

Vietnamese does not use articles the same way English does.

English requires things like:

• a volunteer
• the volunteer
• the equipment

Vietnamese often simply says:

• tình nguyện viên
• dụng cụ vệ sinh

and lets context fill in whether the meaning is definite, indefinite, generic, singular, or plural.

If needed, Vietnamese can add other words to clarify, but it usually does not use direct equivalents of English a/an/the in the same way.

Yes, a little.

The biggest ambiguity is usually in dụng cụ vệ sinh. Depending on context, it might mean:

• cleaning tools
• sanitation equipment
• hygiene tools
• sometimes even bathroom cleaning equipment

So the sentence could be understood as:

• The volunteer disinfects the cleaning equipment
• The volunteer disinfects sanitation tools

The general meaning is clear, but the exact type of equipment depends on context.

You could add words to make number, tense, or the kind of equipment clearer.

For example:

• Các tình nguyện viên đang khử trùng dụng cụ vệ sinh.
  = The volunteers are disinfecting the cleaning equipment.

• Một tình nguyện viên khử trùng các dụng cụ vệ sinh.
  = A volunteer disinfects the cleaning tools.

• Tình nguyện viên khử trùng thiết bị vệ sinh.
  = The volunteer disinfects sanitation equipment.

Vietnamese often starts with a compact, context-dependent sentence like the original one, and then adds extra words only when precision is needed.

A rough learner-friendly pronunciation guide is:

• Tình nguyện viên ≈ tinh nwee-en vyen
• khử trùng ≈ khur choong
• dụng cụ vệ sinh ≈ zoong koo vay sin

A few important notes:

• Vietnamese is a tonal language, so rough English-style spelling is only approximate.
• kh is like a breathy k sound, not like English ch.
• tr and v can vary somewhat by region.
• Final pronunciation is much easier to learn if you hear a native speaker.

So it is best to treat the guide above as only a very rough starting point.