Perhaps you should try some spelling variations:
communications connection » communications connections, communication connection, communications convention
summary dimensioning » smart dimensioning, summary designing, summary defining
connection summary » convection summary, convention summary, correction summary
database under » databases under, database user, database index

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

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