Perhaps you should try some spelling variations:
communication contention » communications convention, communication connection, communication content
contention fast » conventions fast, contention based, contraction fast
fast decision » fat decision, first decision, coast decision
data removing » data resolving, data moving, data recording
data proving » data improving, data providing, data moving

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

• Performing a fuzzy search may retrieve terms with similar spellings: communication contention fast decision ((data removing) or (((data proving) or (data mining))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: communication contention fast decision ((data removing) OR (((data proving) OR (data mining)))).
• Adding a wildcard symbol may retrieve word variants: communication contention fast decision ((data removing) or (((data proving) or (data mining))))*.