Perhaps you should try some spelling variations:
"communicate disease" » "communicated disease", "communicate delegate", "communicate disabled"
"complicate disease" » "complicated diseases", "compleat disease", "complications disease"
"community disease" » "community dispensed", "community disaster", "community dispute"

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