Perhaps you should try some spelling variations:
"diseases drag effect." » "diseases drugs effect.", "diseases dr effect.", "diseases dna effect.", "diseases drag effects.", "diseases dag effect.", "diseases dung effect."
"diseases do effectss." » "diseases dr effectss.", "diseases due effectss.", "diseases _ effectss."
"diseases drug effect." » "diseases drug effects.", "diseases drugs effects.", "diseases xdrug effects."

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: (("diseases do effectss.") OR ((("diseases drug effect.") OR ("diseases drag effect."))))~.
• Removing quotes may allow a broader search: (( diseases do effectss. ) or ((( diseases drug effect. ) or ( diseases drag effect. ))))~.
• Adding a wildcard symbol may retrieve word variants: (("diseases do effectss.") or ((("diseases drug effect.") or ("diseases drag effect."))))*.