Máy hút bụi này còn mới.

In Vietnamese, demonstratives like này (this) usually come after the noun, not before it.

So:

• máy hút bụi này = this vacuum cleaner
• literally: vacuum cleaner this

This is a very common word order in Vietnamese:

• nhà này = this house
• xe này = this car
• người này = this person

So máy hút bụi này is completely normal Vietnamese word order.

Here, còn means still.

So còn mới means still new.

The sentence suggests that the vacuum cleaner is not old or worn out yet. It may have been used a little, but it is still in new condition.

Compare:

• mới = new
• còn mới = still new

That extra còn adds the idea that the condition has remained new up to now.

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

In English:

• This vacuum cleaner is new.

In Vietnamese:

• Máy hút bụi này mới.

There is no need for a separate word meaning is here. The adjective mới directly describes the noun.

This is very common in Vietnamese:

• Nhà này đẹp. = This house is beautiful.
• Cô ấy cao. = She is tall.
• Cà phê nóng. = The coffee is hot.

So Máy hút bụi này còn mới is natural because Vietnamese does not need is in this kind of sentence.

By itself, mới means new.

But in còn mới, it means more like:

• still new
• still in good/new condition
• not old yet

So the full sentence is slightly more nuanced than just This vacuum cleaner is new. It often implies that the item may not be brand new, but it remains in very good condition.

Máy hút bụi is a compound noun:

• máy = machine
• hút = suck / vacuum
• bụi = dust

So it literally means something like dust-sucking machine, which is the Vietnamese way to say vacuum cleaner.

This kind of compound is very common in Vietnamese, where the meaning becomes clear by combining smaller words.

A classifier is not always required.

With many nouns, especially when speaking generally or naturally, you can say:

• máy hút bụi này = this vacuum cleaner

You may sometimes hear a classifier in other contexts, but here it is perfectly normal to say the noun phrase without one.

Vietnamese classifiers are important, but learners often expect them in every phrase. In reality, usage depends on structure, style, and the noun itself. In this sentence, leaving it as máy hút bụi này is natural.

The sentence follows this pattern:

noun + demonstrative + adjective

So:

• Máy hút bụi = vacuum cleaner
• này = this
• còn mới = still new

Full structure:

• Máy hút bụi này còn mới.
• literally: Vacuum cleaner this still new.

A more general pattern is:

[thing] + [this/that] + [description]

For example:

• Cuốn sách này hay. = This book is interesting.
• Cái bàn kia cũ. = That table is old.

Yes. Máy hút bụi này mới is grammatical and natural.

The difference is:

• Máy hút bụi này mới. = This vacuum cleaner is new.
• Máy hút bụi này còn mới. = This vacuum cleaner is still new.

Adding còn gives a stronger sense of it has remained new / it is not old yet.

So both work, but còn adds nuance.

Yes.

• này = this
• kia = that

So:

• Máy hút bụi này còn mới. = This vacuum cleaner is still new.
• Máy hút bụi kia còn mới. = That vacuum cleaner is still new.

The grammar stays the same. Only the distance or reference changes.

A rough pronunciation guide is:

Máy hút bụi này còn mới
≈ mai hoot boo-ee nai kawn moi

A few notes:

• máy has a rising tone
• hút has a high, sharp tone
• bụi has a heavy, low tone with a glottal feel in many accents
• này has a low falling tone
• còn has a rising tone
• mới has a rising broken tone

If you are learning pronunciation, it is best to learn the tones with audio, because Vietnamese tones are very important for being understood.

Yes, it is very natural.

A Vietnamese speaker could use it when talking about the condition of an item, for example when:

• describing something in the house
• selling a used appliance
• commenting that an item has not aged much

It sounds like normal everyday Vietnamese and is a good example of how Vietnamese describes objects without using a separate word for is.