Perhaps you should try some spelling variations:
communicating communication » communication communication, communicate communication, communication communicating
communication based » communication between
based dimensions » based dimension, basic dimensions, based dimensioning
index theorem » index theory
index three » index tree, index free, indoor three

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• Performing a fuzzy search may retrieve terms with similar spellings: communicating communication based dimensions ((index three) or (index theorem))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: communicating communication based dimensions ((index three) OR (index theorem)).
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