Perhaps you should try some spelling variations:
classical source » classical sources, classic source, classical force
sources library » resource library, series library, sounds library
studies library » studies literary, studies libraries, itunes library
source library » source libraries
classical core » classical codes, classical case, classical charge
core library » code library, case library, core libraries

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 (studies library)) ) OR ( classical source library ))) OR ( classical core library )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((( classical ((sources library) OR (studies library)) ) or ( classical source library ))) or ( classical core library ))".
• Adding a wildcard symbol may retrieve word variants: (((( classical ((sources library) OR (studies library)) ) or ( classical source library ))) or ( classical core library ))*.