Perhaps you should try some spelling variations:
communication collocation » communication collaboration, communication collections, communication cooperation
collocation methods » collocation method, collection methods, allocation method
methods diffusion » networks diffusion, methods decision
tuple spaces » tuple space, triple space
shape spaces » shape space, shared spaces, state spaces
type spaces » state 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 collocation methods diffusion ((((tuple spaces) or (shape spaces))) or (type spaces))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: communication collocation methods diffusion ((((tuple spaces) OR (shape spaces))) OR (type spaces)).
• Adding a wildcard symbol may retrieve word variants: communication collocation methods diffusion ((((tuple spaces) or (shape spaces))) or (type spaces))*.