VectorStore get multiple collections for retrieval

[JackLeick]

I have a folder of documents, and each has been added to a persistent ChromaDB vectorstore.

I'd like to be able to run queries against a subset (2+ potentially) of these documents, instead of the entirety. I know I can do the following to get specific ones:
db._collection.get('id')

Is there any way to do this? And as a follow on question, if the documents are large and need to be split, could all be retrieved by the same ID?