Perhaps you should try some spelling variations:
communications convention » communications connections, communication connection, communication conversation
communication connecting » communication collections, communication creating, communication communicating
existing databases » testing databases, building databases
summary existing » summarise existing, summary writing, summary testing

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((communications convention) or (communication connecting)) summary existing databases under~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((communications convention) OR (communication connecting)) summary existing databases under.
• Adding a wildcard symbol may retrieve word variants: ((communications convention) or (communication connecting)) summary existing databases under*.