Perhaps you should try some spelling variations:
"infections diseases" » "infectious disease", "infection disease", "infective diseases", "infectious diseases", "infection diseases", "infections cases"
"infection diseases" » "infectious disease"
"infections disease" » "infectious disease", "infection disease", "infections case"

Try widening your search to All Fields.

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