Perhaps you should try some spelling variations:
communication concepts » communication circuits, communication congresses, communication channels
over dimensional » lower dimensional, one dimensional, level dimensional
concepts over » concepts other, concerns over, concepts one
shared spaces » shared space, shared stocks
sample spaces » sample space, sample speeches, sample sizes
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 over dimensional ((((tuple spaces) or (shared spaces))) or (sample spaces))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: communication concepts over dimensional ((((tuple spaces) OR (shared spaces))) OR (sample spaces)).
• Adding a wildcard symbol may retrieve word variants: communication concepts over dimensional ((((tuple spaces) or (shared spaces))) or (sample spaces))*.