Perhaps you should try some spelling variations:
communication communications » communication communication, communication communicating, communications communication
design dimensions » design decisions
basic dimensions » based dimension, pacific dimensions, family dimensions
tree theorem » three theorems, free theorems, type theorem

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

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