Perhaps you should try some spelling variations:
"communicate diseases" » "communicable diseases", "communicated disease", "communicable disease"
"communicate strategy" » "communicative strategy", "communication strategy", "community strategy"
"complicated diseases" » "complicated cases", "complex diseases", "mediated diseases"
"communicate state" » "communicating state", "communication state", "communicate make"

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