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