Perhaps you should try some spelling variations:
communication conversation » communication information, communication communication, communication foundation
communication cohesion » communication collections, communication control, communication cost
centers decisions » center decision, better decisions, centers designs
david davies » david davis, david daniels, david david

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((communication conversation) OR (communication cohesion)) centers decisions david davies~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((communication conversation) OR (communication cohesion)) centers decisions david davies".
• Adding a wildcard symbol may retrieve word variants: ((communication conversation) OR (communication cohesion)) centers decisions david davies*.