Perhaps you should try some spelling variations:
communication connection » communications connections, communication connecting, communication collections
connection based » connections basis, connection brad, connection east
based dispersion » wave dispersion, gas dispersion, based discussion
range spaces » gauge spaces, range states, large spaces
large sparse » large scale
use spaces » tuple spaces, phase spaces, gauge spaces

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

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