Perhaps you should try some spelling variations:
communities extensions » communities dimensions, community extensions, communities perceptions
communication control » communication concepts, communication culture, communication channel
control communities » control commodities, coral communities, content communities
whose spaces » phase spaces, shape spaces, whose race
large sparse » large scale
use spaces » tuple spaces, phase spaces, gauge spaces

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

• Performing a fuzzy search may retrieve terms with similar spellings: communication control communities extensions ((((use spaces) or (whose spaces))) or (large sparse))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: communication control communities extensions ((((use spaces) OR (whose spaces))) OR (large sparse)).
• Adding a wildcard symbol may retrieve word variants: communication control communities extensions ((((use spaces) or (whose spaces))) or (large sparse))*.