Perhaps you should try some spelling variations:
communication relations » communication relational, communication relating, communications regulations
case dimensions » scale dimensions, based dimensions, class dimensions
array string » array strong, arrays strings, array sharing
array arcing » array forming, array probing, array sharing
array along » arrays long, array paving, array strong

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

• Performing a fuzzy search may retrieve terms with similar spellings: communication relations case dimensions ((((array along) or (array string))) or (array arcing))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: communication relations case dimensions ((((array along) OR (array string))) OR (array arcing)).
• Adding a wildcard symbol may retrieve word variants: communication relations case dimensions ((((array along) or (array string))) or (array arcing))*.