Perhaps you should try some spelling variations:
communicative function » communicative functions, communication function, communication functions
based extension » based extraction
array forming » array format, array arcing, array fermi
array string » array strong, arrays strings, array sharing
arrays a » arrays _

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

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