Perhaps you should try some spelling variations:
communication collision » communication commission, communication cohesion, communication collections
collision system » collection system, collection systems, vision system
system dimension » systems dimensions, erste dimension, system diffusion
larger spaces » larger species, large space, larger scale
border spaces » holder spaces, ordered 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: communication collision system dimension ((((larger spaces) or (border spaces))) or (large sparse))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: communication collision system dimension ((((larger spaces) OR (border spaces))) OR (large sparse)).
• Adding a wildcard symbol may retrieve word variants: communication collision system dimension ((((larger spaces) or (border spaces))) or (large sparse))*.