Here are some tips:
Use Advanced Search, if you are looking for a specific title, author, subject, date or language.
Use quotation marks to search for exact phrases, e.g. “Cuban literature”.
Use AND (in all-caps) to ensure that both terms are in the results, or OR (in all-caps) tom ensure that one or the other term may be in the results.
Other Library Catalogs:
Here are some ebook platforms where you can find many titles in Spansih.