Men gốm ở trên kệ.

• men = glaze, enamel
• gốm = ceramics, pottery
• ở = to be located at/in/on
• trên = on, above
• kệ = shelf, rack

So men gốm is ceramic glaze, and ở trên kệ tells you where it is.

In this phrase, men is the main noun, and gốm tells you what kind of glaze it is. So men gốm means ceramic glaze or glaze for pottery.

This can feel backward to an English speaker, because English often puts the material/type first, as in ceramic glaze. Vietnamese compounds do not always follow English word order.

Vietnamese often does not use a separate verb like English is in the same way. In location sentences, ở does the job of expressing be located.

So:

• X ở Y = X is at/in/on Y

That is why Men gốm ở trên kệ naturally means The ceramic glaze is on the shelf.

Because là is mainly used for identity or classification, not location.

For example:

• Đây là men gốm. = This is ceramic glaze.
• Men gốm ở trên kệ. = The ceramic glaze is on the shelf.

So là tells you what something is, while ở tells you where something is.

ở trên kệ is the full, clear way to say is on the shelf.
trên kệ can also appear, but it is more shortened and depends more on context.

For a learner, ở trên kệ is the safer pattern:

• Sách ở trên bàn. = The book is on the table.
• Men gốm ở trên kệ. = The ceramic glaze is on the shelf.

It can mean both, depending on context.

• If something is resting on a surface, trên is often translated as on.
• If something is higher than something else, it can mean above.

With kệ (shelf), the most natural meaning is usually on the shelf.

Not necessarily. After location expressions like trên, Vietnamese often uses the noun without a classifier.

So trên kệ is perfectly natural.

You may see a classifier if the speaker wants to be more specific:

• trên cái kệ đó = on that shelf
• trên một cái kệ = on a shelf

But in your sentence, trên kệ is normal.

Vietnamese does not have articles like English the and a/an. Whether something is definite or indefinite usually comes from context.

So men gốm could mean:

• the ceramic glaze
• ceramic glaze

And kệ could mean:

• the shelf
• a shelf

The English translation has to choose what sounds best from the situation.

Usually men gốm refers to the substance or material, so it behaves more like a mass noun, similar to glaze in English.

If you want to count containers of it, you would usually add a unit word:

• một chai men gốm = a bottle of ceramic glaze
• hai lọ men gốm = two jars of ceramic glaze

So in Men gốm ở trên kệ, the phrase most naturally refers to the glaze itself, not to a counted object unless context makes that clear.

Yes, it is grammatical and understandable. It is a straightforward location sentence.

Depending on context, a native speaker might make it more specific, for example:

• Men gốm ở trên kệ đó. = The ceramic glaze is on that shelf.
• Lọ men gốm ở trên kệ. = The jar of ceramic glaze is on the shelf.

But the original sentence is still a valid basic sentence for learning the structure X ở trên Y.