Khu này rất yên tĩnh.

Khu means an area, zone, section, or sometimes neighborhood, depending on context.

In Khu này rất yên tĩnh, khu này is something like:

• this area
• this neighborhood
• this part of town

It is a fairly general word, so the best English translation depends on the situation.

In Vietnamese, words like này (this) usually come after the noun.

So:

• khu này = this area
• nhà này = this house
• người này = this person

This is different from English, where this comes before the noun.

A useful pattern is:

• noun + này = this + noun
• noun + đó/kia = that + noun

Vietnamese often does not use a verb like to be when describing something with an adjective.

So in English:

• This area is very quiet.

But in Vietnamese:

• Khu này rất yên tĩnh.

Literally, the structure is closer to:

• This area very quiet.

That is completely normal in Vietnamese.

No, là is not needed here.

A very common learner mistake is to insert là before adjectives. In this sentence, that would sound unnatural.

• Correct: Khu này rất yên tĩnh.
• Not natural here: Khu này là rất yên tĩnh.

Why? Because yên tĩnh is an adjective describing the subject.

Là is more commonly used when one noun is being identified as another noun, for example:

• Đây là khu dân cư. = This is a residential area.

But with adjective descriptions like quiet, beautiful, expensive, Vietnamese usually does not use là.

Rất means very.

So:

• yên tĩnh = quiet
• rất yên tĩnh = very quiet

It goes before the adjective, just like very does in English.

You can compare:

• Khu này yên tĩnh. = This area is quiet.
• Khu này rất yên tĩnh. = This area is very quiet.

Yên tĩnh means quiet, peaceful, or calm, especially for a place.

It is often used for:

• neighborhoods
• streets
• rooms
• cafés
• the countryside

It is not exactly the same as im lặng.

• yên tĩnh = quiet, peaceful, not noisy
• im lặng = silent, with no speaking or sound, or silence in a social situation

So for a place like an area or neighborhood, yên tĩnh is the natural choice.

The sentence follows a very common Vietnamese pattern:

• subject + degree word + adjective

So here:

• Khu này = subject
• rất = degree word (very)
• yên tĩnh = adjective

So:

• Khu này rất yên tĩnh.

A good model to remember is:

• Noun phrase + rất + adjective

For example:

• Căn phòng này rất nhỏ. = This room is very small.
• Con đường này rất đông. = This street is very crowded.

Yes. The exact English translation depends on context.

Khu is broad. It can refer to:

• an area
• a district-like section
• a neighborhood
• a zone

So if someone is talking about where they live, this neighborhood may sound best in English. If they are talking more generally about location, this area may be better.

Yes.

If you say:

• Khu này yên tĩnh.

it still means This area is quiet.

Adding rất makes it stronger:

• Khu này rất yên tĩnh. = This area is very quiet.

So rất is optional if you do not want to emphasize the adjective as much.

A rough pronunciation guide is:

• Khu — level tone
• này — low falling tone
• rất — sharp rising tone, ending with -t
• yên — level tone
• tĩnh — creaky broken rising tone

A very rough English-friendly guide would be something like:

• khoo nigh zat yen ting

But that is only approximate. The tones matter a lot in Vietnamese, so it is best to listen to native audio if possible.

A couple of pronunciation notes:

• kh is like a breathy k/h sound
• nh in này is like the ny in canyon
• tĩnh ends with -nh, which is different from English ng

No, not in normal Vietnamese.

The natural order is:

• khu này = this area

Putting này before the noun would sound wrong in standard Vietnamese.

So for demonstratives, remember:

• nhà này = this house
• xe này = this vehicle/car
• khu này = this area

Usually, no. Vietnamese adjectives often come after the noun when directly modifying it.

So:

• khu yên tĩnh = a quiet area

not:

• yên tĩnh khu

In your sentence, though, yên tĩnh is not directly attached to the noun inside the noun phrase. It is the main description of the subject:

• Khu này rất yên tĩnh. = This area is very quiet.

So an English speaker should notice two things:

1. này comes after the noun
2. adjectives in Vietnamese do not behave exactly like English adjectives

Yes, depending on style and context.

Some common alternatives are:

• Khu vực này rất yên tĩnh. = This area is very quiet.
• Nơi này rất yên tĩnh. = This place is very quiet.
• Chỗ này rất yên tĩnh. = This place is very quiet. (more conversational)

Differences:

• khu = area/zone/neighborhood
• khu vực = area/region, a bit more formal
• nơi/chỗ = place

Your original sentence is natural and correct.