Perhaps you should try some spelling variations:
communication relational » communication relating, communication international, communication relationships
relational based » relationally based, relation based, relations based
based extraction » based interaction, phase extraction, based education
array range » ray range
array ang » arrays ang, array along, array nano
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: communication relational based extraction ((((array ang) or (array range))) or (arrays a))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: communication relational based extraction ((((array ang) OR (array range))) OR (arrays a)).
• Adding a wildcard symbol may retrieve word variants: communication relational based extraction ((((array ang) or (array range))) or (arrays a))*.