Perhaps you should try some spelling variations:
"communicate diseases" » "communicable diseases", "communicable disease", "communicate discover"
"communicate disabled" » "communicate discover", "communicate listen", "communicate defined"
"communicated disease" » "communicable disease", "communicable diseases", "communicate state"
"complicated diseases" » "complicated cases", "complex diseases", "complicated case"
"mediated diseases" » "related diseases", "medical diseases", "related disease"

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