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

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