Perhaps you should try some spelling variations:
communication affecting » communication effective, communication connecting, communication harvesting
communicating affection » communication affection, communicate affection, communicating effectively
relational database » relational databases
database optimising » databases optimizing, data optimising, database optimized
xml relational » _ relational, non relational, 2 relational

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((communication affecting) or (communicating affection)) xml relational database optimising~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((communication affecting) OR (communicating affection)) xml relational database optimising.
• Adding a wildcard symbol may retrieve word variants: ((communication affecting) or (communicating affection)) xml relational database optimising*.