Sản phẩm này còn bảo hành.

A natural word-by-word breakdown is:

• sản phẩm = product
• này = this
• còn = still, remaining
• bảo hành = warranty / to provide warranty service

So the sentence literally feels like:

• This product still warranty

But in natural English, it means:

• This product is still under warranty
• This product still has warranty coverage left

Vietnamese often leaves out words that English requires, such as is, under, or has, if the meaning is already clear from context.

In Vietnamese, demonstratives like this, that, these, and those usually come after the noun.

So:

• sản phẩm này = this product
• cái điện thoại đó = that phone

This is the normal Vietnamese word order:

• noun + demonstrative

So sản phẩm này is exactly how Vietnamese says this product.

Vietnamese often does not use a verb meaning to be in sentences where English would.

In English, you say:

• This product is still under warranty

In Vietnamese, you can simply say:

• Sản phẩm này còn bảo hành

The relationship is understood without adding a separate word for is.

This is very common in Vietnamese. For example:

• Tôi khỏe = I am well
• Nhà lớn = The house is big

So the lack of is here is normal Vietnamese grammar.

Here, còn means still or still remaining.

It tells you that the warranty has not expired yet.

So:

• còn bảo hành = still under warranty
• còn thời hạn bảo hành = still has warranty time remaining

A helpful contrast is:

• còn = still, not finished yet
• hết = finished, over, expired

So:

• Sản phẩm này còn bảo hành = This product is still under warranty
• Sản phẩm này hết bảo hành rồi = This product is out of warranty already

It is a bit flexible.

Bảo hành can refer to:

• warranty as a concept or service
• to honor/provide warranty service

In this sentence, it functions in a very compact, natural Vietnamese way. The meaning is basically:

• still has warranty coverage
• is still covered by warranty

So even though English would normally use a prepositional phrase like under warranty, Vietnamese can simply use còn bảo hành.

This kind of compact expression is common in everyday Vietnamese.

It is natural, especially in everyday speech and sales/service contexts, but it is somewhat shortened.

More explicit versions include:

• Sản phẩm này còn thời hạn bảo hành.
  = This product is still within the warranty period.

• Sản phẩm này vẫn còn bảo hành.
  = This product is still under warranty.

• Sản phẩm này còn được bảo hành.
  = This product is still covered by warranty.

Your original sentence is concise and common, especially when the context is already about product status, repair, or returns.

Both can mean still under warranty, but vẫn còn adds a little more emphasis.

• còn bảo hành = still under warranty
• vẫn còn bảo hành = still under warranty, and the still is a bit more explicit or emphatic

In many situations, they are very close in meaning.

You can think of it like this:

• còn = still / remaining
• vẫn còn = still, indeed still, still at this point

So if someone asks whether the warranty has expired, answering with vẫn còn bảo hành can sound slightly more emphatic.

A very common way is:

• Sản phẩm này hết bảo hành rồi.

Breakdown:

• hết = finished, used up, over
• rồi = already

So this means:

• This product is already out of warranty
• This product is no longer under warranty

Other possible versions:

• Sản phẩm này không còn bảo hành nữa.
  = This product is no longer under warranty.

• Sản phẩm này đã hết hạn bảo hành.
  = This product’s warranty period has expired.

All are useful, but hết bảo hành rồi is especially common in everyday speech.

Yes, but the meaning is a little different.

• Sản phẩm này có bảo hành = This product has a warranty / comes with a warranty
• Sản phẩm này còn bảo hành = This product is still under warranty now

So:

• có bảo hành focuses on whether warranty exists as a feature
• còn bảo hành focuses on whether the warranty is still valid at this time

For example, a new product in a shop might be described as:

• Sản phẩm này có bảo hành 12 tháng.
  = This product comes with a 12-month warranty.

A used item being checked later might be described as:

• Sản phẩm này còn bảo hành.
  = This product is still under warranty.

Yes. Được bảo hành is also common, and it sounds a bit more explicit.

Compare:

• Sản phẩm này còn bảo hành.
• Sản phẩm này còn được bảo hành.

The second version makes the idea of being covered clearer. It is closer to:

• This product is still covered by warranty

Meanwhile, the shorter version is more compact and conversational.

You may also hear:

• Sản phẩm này được bảo hành 12 tháng.
  = This product is covered by a 12-month warranty.

So được bảo hành is very useful when you want a clearer passive-like meaning.

A rough pronunciation guide is:

• Sản phẩm này còn bảo hành
• roughly: san phum nay con bao hanh

A few tone notes:

• sản has a dipping/creaky tone
• phẩm has a heavy falling tone
• này has a low falling tone
• còn has a rising tone
• bảo has a dipping/creaky tone
• hành has a low tone

If you want to sound natural, pay special attention to:

• phẩm in sản phẩm
• bảo
• hành

These tones matter a lot, because changing them can create a different word or make you harder to understand.

Sản phẩm is correct and natural, especially in:

• business
• product descriptions
• customer service
• advertisements
• formal or semi-formal contexts

But in everyday speech, people often use a more specific noun instead, such as:

• điện thoại này còn bảo hành = this phone is still under warranty
• máy này còn bảo hành = this machine/device is still under warranty
• cái này còn bảo hành = this thing/item is still under warranty

So sản phẩm này còn bảo hành is perfectly fine, but in casual conversation, the noun is often replaced by the actual item name.