Perhaps you should try some spelling variations:
communicate diseases » communicated disease, communicate disabled, communicate messages
complicated diseases » complicated cases, complex diseases, mediated diseases
communicate discover » community discovery, communicate disabled, communications over

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 ( communicate discover ))))) 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 ( communicate discover ))))) or ( communicable disease ))".
• Adding a wildcard symbol may retrieve word variants: (((( communicable diseases ) or ((( ((communicate diseases) OR (complicated diseases)) ) or ( communicate discover ))))) or ( communicable disease ))*.