Perhaps you should try some spelling variations:
communication concepts » communication circuits, communication congresses, communication channels
comment dimension » community dimension, content dimensions, component dimensions
concepts comment » concepts comments, concept comment, concepts common
tuple spaces » tuple space, type spaces, triple space
scale spaces » scale space, sample spaces
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 comment dimension ((tuple spaces) or (((use spaces) or (scale spaces))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: communication concepts comment dimension ((tuple spaces) OR (((use spaces) OR (scale spaces)))).
• Adding a wildcard symbol may retrieve word variants: communication concepts comment dimension ((tuple spaces) or (((use spaces) or (scale spaces))))*.