Perhaps you should try some spelling variations:
communications condition » communicational conditions, communications convention, communications connections
based extraction » based interaction, phase extraction, based education
range spaces » gauge spaces, range states, large spaces
phase spaces » phase space, shape spaces, state spaces
large sparse » large scale

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

• Performing a fuzzy search may retrieve terms with similar spellings: communications condition based extraction ((((range spaces) or (phase spaces))) or (large sparse))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: communications condition based extraction ((((range spaces) OR (phase spaces))) OR (large sparse)).
• Adding a wildcard symbol may retrieve word variants: communications condition based extraction ((((range spaces) or (phase spaces))) or (large sparse))*.