Prospector searches can be limited by the item's format, publication year, language, etc.
To illustrate, please see this example to find books about vampires in Spanish:
Step One: Use a keyword search and type in "vampires" into the search box for finding books:
Step Two: On the left side of the results screen, please find the format and click on the link for books/journals:
Step Three: Choose the language desired (Spanish for this example):