Perhaps you should try some spelling variations:
communication conversion » communication conversation, communications convention, communication cohesion
conversion dale » conversion del, conversion case, conversion based
dale decision » sale decision, scale decision, value decision
group river » group reverse, group denver, group review
group over » groups over, ground cover

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

• Performing a fuzzy search may retrieve terms with similar spellings: communication conversion dale decision ((group river) or (group over))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: communication conversion dale decision ((group river) OR (group over)).
• Adding a wildcard symbol may retrieve word variants: communication conversion dale decision ((group river) or (group over))*.