Perhaps you should try some spelling variations:
communication perception » communication perspective, community perception, communication education
tree dimensional » three dimensional, three dimentional, three dimensionally
perception tree » perception time, perception trans, perception case
enabled space » enabled search, enabled smart, enabled sales
scale spaces » scale space, sample spaces
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 perception tree dimensional ((((scale spaces) or (tuple spaces))) or (enabled space))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: communication perception tree dimensional ((((scale spaces) OR (tuple spaces))) OR (enabled space)).
• Adding a wildcard symbol may retrieve word variants: communication perception tree dimensional ((((scale spaces) or (tuple spaces))) or (enabled space))*.