Perhaps you should try some spelling variations:
communication collocation » communication collaboration, communication collections, communication cooperation
collocation based » allocation based, collocation basic, collaboration based
euclidean minisum » euclidean minimum, euclidean rings
based extension » based extraction
euclidean gibbs » euclidean rings, euclidean graphs, euclidean logics

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 collocation based extension ((euclidean gibbs) OR (euclidean minisum))~.
• Adding a wildcard symbol may retrieve word variants: communication collocation based extension ((euclidean gibbs) or (euclidean minisum))*.