Perhaps you should try some spelling variations:
communication concepts » communication circuits, communication congresses, communication channels
concepts extensions » concepts extension, concept's extension, concepts tensions
arrays probing » array probing, rays probing, arrays producing
array imaging » arrays imaging, airway imaging, ray imaging

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

• Performing a fuzzy search may retrieve terms with similar spellings: interpersonal communication concepts extensions ((array imaging) or (arrays probing))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: interpersonal communication concepts extensions ((array imaging) OR (arrays probing)).
• Adding a wildcard symbol may retrieve word variants: interpersonal communication concepts extensions ((array imaging) or (arrays probing))*.