Perhaps you should try some spelling variations:
"communication strategy" » "communication strategies", "communication studies"
"communicated disease" » "communicable disease", "complicated diseases", "communicate state"
"communicate strategy" » "communicative strategy", "community strategy", "communicate state"
"communication state" » "communication style", "communicating state", "communication savante"

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: (("communicable diseases") OR ((("communicated disease") OR ((((("communicate strategy") OR ("communication strategy"))) OR ("communication state")))))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"communicable diseases\") or (((\"communicated disease\") or (((((\"communicate strategy\") OR (\"communication strategy\"))) or (\"communication state\"))))))".
• Removing quotes may allow a broader search: (( communicable diseases ) or ((( communicated disease ) or ((((( communicate strategy ) OR ( communication strategy ))) or ( communication state )))))).
• Adding a wildcard symbol may retrieve word variants: (("communicable diseases") or ((("communicated disease") or ((((("communicate strategy") OR ("communication strategy"))) or ("communication state"))))))*.