Mục lục trực tuyến có từ khóa.

Mục lục usually means table of contents, index, or sometimes catalog, depending on context.

In this sentence, it refers to some kind of organized listing. A learner should know that:

• mục = item/entry/section
• lục = record/list (in this kind of compound)

So mục lục is a fixed expression meaning a structured list of contents or entries, not just any random list.

Because in Vietnamese, descriptive words often come after the noun.

So:

• mục lục trực tuyến = online index / online table of contents

This is the normal Vietnamese word order. English says:

• online index

but Vietnamese says:

• index online

in that same noun + description pattern.

Trực tuyến means online.

It is a common formal or neutral way to say something is connected to the internet or available on the web.

For example:

• học trực tuyến = study online
• mua sắm trực tuyến = shop online
• mục lục trực tuyến = online index/table of contents

In other contexts, Vietnamese speakers may also use online directly as a borrowed English word in casual speech, but trực tuyến is standard Vietnamese.

Here, có means has or contains.

So the structure is:

• Mục lục trực tuyến = the online index
• có = has/contains
• từ khóa = keyword(s)

So có links the subject to something it possesses or includes.

Important: có can also mean there is/there are in other sentence patterns, but here it clearly means has/contains because it follows the subject mục lục trực tuyến.

It can mean keyword or keywords. Vietnamese nouns usually do not change form for singular vs. plural.

So:

• từ khóa = keyword / keywords

You understand the number from context.

If the speaker wants to make plurality clearer, they might say:

• có các từ khóa = has the keywords / has keywords
• có nhiều từ khóa = has many keywords

Without extra words, từ khóa is neutral about number.

Vietnamese does not use articles the same way English does.

So Mục lục trực tuyến có từ khóa can be understood as:

• The online index has keywords
• An online index has keywords
• Online indexes have keywords

depending on context.

Vietnamese often leaves definiteness unstated unless it needs to be made clear by context or by extra words.

Yes. Literally:

• từ = word
• khóa = key

So từ khóa literally means key word, which matches English very closely.

As a compound, it functions just like the English term keyword.

Yes, it is grammatical and understandable.

It sounds fairly neutral and concise. Depending on the situation, a native speaker might also say something slightly fuller, such as:

• Mục lục trực tuyến có các từ khóa.
• Mục lục trực tuyến chứa từ khóa.

The original sentence is still fine. It just sounds a little compact, which is common in informational or technical contexts.

Not in the best translation of this sentence.

Although có can mean there is/there are, that usually happens in a different structure, such as:

• Có từ khóa trong mục lục trực tuyến. = There are keywords in the online index.

But in your sentence:

• Mục lục trực tuyến có từ khóa.

the subject comes first, so có is best understood as has or contains.

A rough pronunciation guide is:

Mục lục trực tuyến có từ khóa
≈ mook look chook-too-yen kaw tuh kwah

That is only approximate, but it may help at first.

A few pronunciation notes:

• mục and lục have a heavy, short ending sound.
• trực begins with tr, which is not exactly the same as English ch or tr, though learners often approximate it.
• tuyến has a glide like uyê.
• từ has the ư vowel, which does not exist in English.
• khóa begins with kh, a breathy sound, not exactly plain English k.

If you want to sound more natural, tones matter a lot as well.

Because Vietnamese often puts a descriptive element directly after the noun without any extra word.

So:

• mục lục trực tuyến = online index
• sách mới = new book
• nhà lớn = big house

English often needs a different order or sometimes a linking structure, but Vietnamese can simply place the modifier after the noun.

Yes.

Depending on the situation, it could refer to:

• an online table of contents
• an online index
• an online catalog/listing

The exact English word depends on what kind of document or system is being described. Vietnamese often relies on context more than English for this kind of distinction.