Perhaps you should try some spelling variations:
communication concepts » communication circuits, communication congresses, communication channels
sources dimensions » resource dimensions, series dimensions, course dimensions
concepts sources » concepts series
large spaces » larger spaces, large space, gauge spaces
whose spaces » phase spaces, shape spaces, whose race
tuple spaces » tuple space, type spaces, triple space

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

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