Công tác bảo tồn rất khó.

Here, công tác means work, effort, or operations in a fairly formal or official sense.

So công tác bảo tồn means something like:

• conservation work
• the work of conservation
• conservation efforts

A learner may have seen công tác elsewhere meaning something like an official assignment or even a work trip, but in this sentence it means work/activity carried out in a particular field.

Vietnamese noun phrases usually put the main noun first and the word that describes it afterward.

So:

• công tác = work
• bảo tồn = conservation

Together, công tác bảo tồn literally works like work conservation, which in natural English becomes conservation work.

This word order is very common in Vietnamese. The broad category often comes first, and the more specific part follows.

It is originally a verb meaning to conserve / to preserve, but in this sentence it is functioning like a modifier inside the noun phrase công tác bảo tồn.

So even though bảo tồn is verbal in origin, the whole phrase means conservation work.

Vietnamese often allows words to shift function depending on context, without changing form.

Vietnamese often does not use a verb equivalent to to be when linking a subject to an adjective.

So:

• Công tác bảo tồn rất khó.
• literally: Conservation work very difficult.

In natural English, we add is:

• Conservation work is very difficult.

This is completely normal in Vietnamese. With adjectives like khó (difficult), dễ (easy), đẹp (beautiful), tốt (good), no copula is needed.

Rất means very and it comes before the adjective it modifies.

So:

• khó = difficult
• rất khó = very difficult

This is the normal position for rất in Vietnamese:

• rất đẹp = very beautiful
• rất tốt = very good
• rất khó = very difficult

In many Vietnamese grammar explanations, words like khó are called adjectives, but they also behave a bit like stative verbs because they can directly serve as the predicate of a sentence.

That is why:

• Công tác bảo tồn rất khó.

is a complete sentence, even without a separate word for is.

So for a learner, the simplest way to think of khó is:

• meaning: difficult
• grammar: an adjective that can act directly as the predicate

Yes, often you could say:

• Việc bảo tồn rất khó.

This also means Conservation is very difficult or The work of conservation is very difficult.

The difference is mainly tone and nuance:

• công tác bảo tồn sounds more formal, institutional, or official
• việc bảo tồn sounds more general and often more common in everyday explanation

So both are possible, but công tác bảo tồn feels a bit more formal.

It can suggest both, depending on context.

Most naturally, it means:

• The work of conservation is very difficult
• Conservation efforts are very difficult

So it can refer either to:

1. the general activity of conservation, or
2. a specific body of conservation work already understood from context

Vietnamese often leaves that level of specificity to context.

Vietnamese does not use articles the same way English does.

So Công tác bảo tồn rất khó can be understood as:

• Conservation work is very difficult
• The conservation work is very difficult

Which one sounds best in English depends on context.

Vietnamese frequently leaves definiteness unstated unless it needs to be made clear in some other way.

It sounds neutral to somewhat formal.

That is mainly because of công tác, which is a more formal word than something like việc.

So the sentence would fit well in:

• news writing
• reports
• official discussion
• educational writing

In very casual everyday conversation, a speaker might be more likely to use a different phrasing, depending on context.

Word by word:

• công — mid level tone
• tác — rising tone
• bảo — dipping-rising tone
• tồn — low falling tone
• rất — rising tone
• khó — rising tone

A rough learner-friendly pronunciation guide is:

• công tác bảo tồn rất khó
• approximately: gong tak bao ton rut kho

But the tones matter a lot, so the rough spelling is only a temporary aid. It is better to learn each word with its tone from the start.

Yes. This pattern is very common:

• X rất khó = X is very difficult

Examples:

• Bài này rất khó. = This lesson is very difficult.
• Công việc đó rất khó. = That job is very difficult.
• Việc này rất khó. = This is very difficult.

So Công tác bảo tồn rất khó follows a very common Vietnamese sentence pattern:

• subject/topic + degree word + adjective