Perhaps you should try some spelling variations:
communication concepts » communication circuits, communication congresses, communication channels
command dimension » community dimension, comparing dimension, constant dimension
concepts command » concepts common, concepts comments, concepts combined
shared spaces » shared space, shared stocks
tuple spaces » tuple space, type spaces, triple space
use spaces » phase spaces, gauge spaces, whose 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 concepts command dimension ((tuple spaces) or (((use spaces) or (shared spaces))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: communication concepts command dimension ((tuple spaces) OR (((use spaces) OR (shared spaces)))).
• Adding a wildcard symbol may retrieve word variants: communication concepts command dimension ((tuple spaces) or (((use spaces) or (shared spaces))))*.