Perhaps you should try some spelling variations:
communication cohesion » communication collections, communication cost, communication apprehension
communication control » communication concepts, communication culture, communication channel
directional database » dimensional database, dimensional databases, relational database
laser directional » linear directional, planar directional, le directional
database user » databases user, database using, database based

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((communication cohesion) or (communication control)) laser directional database user~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((communication cohesion) OR (communication control)) laser directional database user.
• Adding a wildcard symbol may retrieve word variants: ((communication cohesion) or (communication control)) laser directional database user*.