Perhaps you should try some spelling variations:
classical sources » classical studies, classical spaces
classical source » classic source, classical force, classical resources
sources library » resource library, sources linear, studies library
source library » resource library, source libraries
core library » code library, core libraries, gene library

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "\"((((\\"classical sources library\\") or (\\"classical source library\\"))) or (\\"classical ((core library) OR (case library))\\"))\"".
• Removing quotes may allow a broader search: (((( classical sources library ) or ( classical source library ))) or ( classical ((core library) OR (case library)) )).