Perhaps you should try some spelling variations:
communication relational » communication relating, communication international, communication relationships
relational based » relationally based, relation based, relations based
based extension » based extraction
array forming » array format, array arcing, array fermi
array along » arrays long, array arcing, array paving
arrays a » arrays _

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

• If you are trying to use Boolean operators, they must be ALL CAPS: communication relational based extension ((((array along) OR (array forming))) OR (arrays a))~.
• Adding a wildcard symbol may retrieve word variants: communication relational based extension ((((array along) or (array forming))) or (arrays a))*.