Perhaps you should try some spelling variations:
communication validation » communications evaluation, communication application, communications navigation
validation methods » valuation methods, evaluation methods, visualization methods
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.

• If you are trying to use Boolean operators, they must be ALL CAPS: communication validation methods diffusion ((((tuple spaces) OR (type spaces))) OR (shape spaces))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "communication validation methods diffusion ((((tuple spaces) OR (type spaces))) or (shape spaces))~".
• Adding a wildcard symbol may retrieve word variants: communication validation methods diffusion ((((tuple spaces) OR (type spaces))) or (shape spaces))*.