Perhaps you should try some spelling variations:
communication conversations » communication conversation, communication cooperation, communication constructions
conversations basic » conversations basics, conversation basic, conversational basis
extensions session » dimensions session, extensions design, extensions sergio
expansion session » expression session, expansion semi, expansions decisions

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

• Performing a fuzzy search may retrieve terms with similar spellings: communication conversations basic ((extensions session) or (expansion session)) general~.
• If you are trying to use Boolean operators, they must be ALL CAPS: communication conversations basic ((extensions session) OR (expansion session)) general.
• Adding a wildcard symbol may retrieve word variants: communication conversations basic ((extensions session) or (expansion session)) general*.