Perhaps you should try some spelling variations:
communications communication » communication communication, communicating communication, communication communicating
communication design » communication devices
design dimensions » design decisions
index theorem » index theory
index three » index tree, index free, indoor three

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

• Performing a fuzzy search may retrieve terms with similar spellings: communications communication design dimensions ((index three) or (index theorem))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: communications communication design dimensions ((index three) OR (index theorem)).
• Adding a wildcard symbol may retrieve word variants: communications communication design dimensions ((index three) or (index theorem))*.