Perhaps you should try some spelling variations:
communication communicating » communication communication
communicating basic » communications basic, communication basic, communicating bad
basic dimensional » basic dimensions, bai dimensional, bi dimensional
rees theorem » tree theorem, rice's theorem, bayes theorem

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