Perhaps you should try some spelling variations:
communication information » communication international, communication education
theory extension » theory extensions, theory extending, therapy extensions
array string » array strong, arrays strings, array sharing
array using » arrays using
array long » array along, arrays long, 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 information theory extension ((((array long) or (array using))) or (array string))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: communication information theory extension ((((array long) OR (array using))) OR (array string)).
• Adding a wildcard symbol may retrieve word variants: communication information theory extension ((((array long) or (array using))) or (array string))*.