Perhaps you should try some spelling variations:
communication conversation » communication information, communication cohesion, communication communication
decision character » decision chapter, education character, detection character
educate character » education character, plate character
conversation a » conversation _, conversation about, conversation book

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 conversation a ((decision character) OR (educate character)) level~.
• Adding a wildcard symbol may retrieve word variants: communication conversation a ((decision character) or (educate character)) level*.