How do I use AND or OR in a search in a Library Catalog search?

To get Library Catalog results containing all of your search words, no need to add AND to your search. AND is the default (you can add it; just remember to capitalize it). e.g., children poverty

To get results containing at least one of your search words, join search words with OR (must be capitalized). e.g., sixties OR 1960s OR 60s