Perhaps you should try some spelling variations:
communication relation » communication relations, communication relational, communication relating
based discussion » brief discussion
relation based » correlation based, location based, equation based
array range » ray range
array along » arrays long, array arcing, array paving
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 relation based discussion ((((array range) or (array along))) or (arrays a))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: communication relation based discussion ((((array range) OR (array along))) OR (arrays a)).
• Adding a wildcard symbol may retrieve word variants: communication relation based discussion ((((array range) or (array along))) or (arrays a))*.