Độ dày của bình hoa khá tốt.

Yes. Độ dày means thickness.

• dày = thick
• độ can turn a quality into something like degree/level/measure

So độ dày is literally the degree of thickness, which is why it is translated as thickness. This wording sounds a bit more formal or technical than simply using dày by itself.

Của means of and links two nouns.

So:

• độ dày của bình hoa = the thickness of the vase

Vietnamese commonly expresses this idea as X của Y = X of Y. It is the normal way to show possession or association in sentences like this.

Vietnamese does not have articles like a, an, and the.

So bình hoa can mean:

• a vase
• the vase
• just vase

The exact meaning depends on context. English requires articles much more often than Vietnamese does.

In Vietnamese, adjectives can often act like the predicate by themselves.

So:

• Độ dày của bình hoa khá tốt

literally looks like:

• The thickness of the vase quite good

but it naturally means:

• The thickness of the vase is quite good

This is very common in Vietnamese. A separate word for is is often not needed before adjectives.

Khá means quite, rather, or fairly.

It makes the statement positive, but not extremely strong.

Compare:

• tốt = good
• khá tốt = quite/fairly good
• rất tốt = very good

So khá softens the description compared with rất.

It is understandable, but it sounds a little unusual in everyday Vietnamese.

That is because độ dày is a physical property, and Vietnamese more often describes it with words such as:

• dày = thick
• mỏng = thin
• vừa phải = moderate
• phù hợp = suitable
• ổn = okay / acceptable

So more natural versions might be:

• Bình hoa khá dày. = The vase is fairly thick.
• Độ dày của bình hoa khá ổn. = The vase's thickness is quite acceptable.
• Độ dày của bình hoa khá phù hợp. = The vase's thickness is quite suitable.

Using tốt with độ dày is not impossible, but it is less idiomatic than with something like độ bền (durability).

Yes, and that is often more natural.

• Bình hoa khá dày = The vase is fairly thick
• Độ dày của bình hoa... = The thickness of the vase...

The version with độ dày focuses specifically on the property of thickness. The shorter version focuses on the vase itself and sounds more natural in casual speech.

Bình hoa means flower vase or simply vase.

It is made of:

• bình = container, bottle, vase, jug
• hoa = flower

Together, bình hoa refers to a vase for flowers. Another common word is lọ hoa. Both can mean vase, though the preferred word can vary by region or by the type of container.

Because classifiers are not always required.

Vietnamese often uses classifiers such as cái, chiếc, or con when:

• counting something
• pointing to a specific object
• making the noun phrase sound more concrete

For example:

• cái bình hoa này = this vase

But in a more general descriptive phrase like độ dày của bình hoa, leaving out the classifier is normal and natural.

The sentence can be broken down like this:

• Độ dày = thickness
• của bình hoa = of the vase
• khá tốt = fairly good

So the overall pattern is:

• [noun phrase] + [description/evaluation]

More specifically:

• [head noun] + của + [related noun] + [degree word] + [adjective]

Vietnamese keeps the main idea first, then adds the của phrase, and then gives the comment about it.