Perhaps you should try some spelling variations:
"communicated disease" » "communicable disease", "communicable diseases", "communicate state"
"complicated diseases" » "complicated cases", "complex diseases"
"mediated diseases" » "related diseases", "related disease"
"complicated case" » "complicated cases", "complicated acute", "complicated chapter"
"medical diseases" » "tropical diseases", "viral diseases"

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