Perhaps you should try some spelling variations:
"communicated diseases" » "communicated disease", "communicate disabled", "communicate discover"
"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: (((((("communicated diseases") OR ("communicable disease"))) OR ("communicable diseases"))) OR ((("complicated diseases") OR ("mediated diseases"))))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"communicated diseases\") OR (\"communicable disease\"))) or (\"communicable diseases\"))) or (((\"complicated diseases\") or (\"mediated diseases\"))))*".
• Removing quotes may allow a broader search: (((((( communicated diseases ) OR ( communicable disease ))) or ( communicable diseases ))) or ((( complicated diseases ) or ( mediated diseases ))))*.