Keyword searches are a good way to start, but subject searches can be more specific. To execute a subject search, choose "subject" from the drop-down menu in the catalog or a database. The Fashion Institute of Technology's Subject Guide for Art History & Fine Arts lists hundreds of subject terms appropriate for art historical research.
Subjects for Italian Renaissance art history include:
Specific media are also good subject words: painting, sculpture, altarpieces, bronze
Mix and match for the broadest search, for example: this search for subject: art / subject: Renaissance / subject: Italy.
To identify the subjects used to describe a book, look for the "subjects" that are listed at the bottom of the full record.