也许你应该尝试一些拼写变化:
communication foundation » communication education, communication communication, communication information
communication cohesion » communication collections, communication control, communication cost
directional database » dimensional database, dimensional databases, relational database
based directional » based bidirectional, based direction, laser 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 foundation) or (communication cohesion)) based directional database user~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((communication foundation) OR (communication cohesion)) based directional database user.
• Adding a wildcard symbol may retrieve word variants: ((communication foundation) or (communication cohesion)) based directional database user*.