Perhaps you should try some spelling variations:
communication function » communication functions, communication foundation, communicative functions
based extension » based extraction
array forming » array format, array arcing, array fermi
array string » array strong, arrays strings, 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 function based extension ((((array forming) or (array string))) or (arrays ang))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: communication function based extension ((((array forming) OR (array string))) OR (arrays ang)).
• Adding a wildcard symbol may retrieve word variants: communication function based extension ((((array forming) or (array string))) or (arrays ang))*.