Perhaps you should try some spelling variations:
"diseases drugs effectss." » "disease drugs effectss.", "disease drug effectss.", "diseases dogs effectss.", "diseases drugs effects.", "diseases drug effects.", "diseases drugs effective."
"diseases drag effect." » "diseases dr effect.", "diseases dna effect.", "diseases during effect.", "diseases drag effects.", "diseases dag effect.", "diseases dung effect."
"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 drugs effectss.") OR ((("diseases drug effect.") OR ("diseases drag effect."))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"diseases drugs effectss.\") or (((\"diseases drug effect.\") OR (\"diseases drag effect.\"))))~".
• Removing quotes may allow a broader search: (( diseases drugs effectss. ) or ((( diseases drug effect. ) OR ( diseases drag effect. ))))~.
• Adding a wildcard symbol may retrieve word variants: (("diseases drugs effectss.") or ((("diseases drug effect.") OR ("diseases drag effect."))))*.