Perhaps you should try some spelling variations:
classical sources » classical studies, classical spaces
sources library » source library, resource library, studies library
classical case » classical chaos, classical chinese

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (( classical sources library ) OR ( classical case library )).
• Adding a wildcard symbol may retrieve word variants: (( classical sources library ) or ( classical case library ))*.