Perhaps you should try some spelling variations:
communication case » communication channels, communication culture
data decisions » data decision, death decisions, fate decisions
david walker » dandy walker, david warren, dale walker
david parker » david payne, david pearce
david parra » david murray, david warren, david harris
case data » cases data, cause data, base data

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 case data decisions ((david walker) OR (((david parker) OR (david parra))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "communication case data decisions ((david walker) or (((david parker) OR (david parra))))~".
• Adding a wildcard symbol may retrieve word variants: communication case data decisions ((david walker) or (((david parker) OR (david parra))))*.