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