Perhaps you should try some spelling variations:
communication functions » communicative functions, communication foundations, communication foundation
functions based » function based
based extension » based extraction
array imaging » arrays imaging, airway imaging, ray imaging
array arcing » array forming, array probing, array sharing
arrays ang » arrays a

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

• Performing a fuzzy search may retrieve terms with similar spellings: communication functions based extension ((((array imaging) or (array arcing))) or (arrays ang))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: communication functions based extension ((((array imaging) OR (array arcing))) OR (arrays ang)).
• Adding a wildcard symbol may retrieve word variants: communication functions based extension ((((array imaging) or (array arcing))) or (arrays ang))*.