Learn Hardcore Russian: Она принесла кое-какие документы.

Кое-какие means something like some, certain, or a few particular. It suggests that the speaker has some specific documents in mind, but either does not want to name them, does not think the exact details matter, or assumes the listener does not need the full list.

So кое-какие документы is not just a random some documents. It often has a nuance like:

some particular documents
certain documents
a few documents

It can sometimes sound slightly vague but not completely indefinite.

How is кое-какие different from какие-то?

This is a very common question, because both can be translated as some.

A useful rough distinction is:

кое-какие = some particular ones, often known to the speaker
какие-то = some kind of / some random / some unspecified, often vaguer

So:

Она принесла кое-какие документы = she brought certain documents / some particular documents
Она принесла какие-то документы = she brought some documents or other, possibly with more uncertainty or vagueness

In real speech, the difference is not always huge, but кое-какие often suggests a bit more intention or specificity.

Why is there a hyphen in кое-какие?