Perhaps you should try some spelling variations:
"diseases drugs effectss." » "disease drugs effectss.", "diseases dogs effectss.", "diseases douglas effectss.", "diseases drugs effects.", "diseases drug effects.", "diseases drugs effective."
"disease drug effective." » "disease drugs effective.", "disease drug effects.", "disease drug affecting.", "disease drug effectsive.", "disease drag effective.", "disease drugs effectsive."
"diseases drug effect." » "diseases drug effects.", "diseases drag effect.", "diseases drugs 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 ("disease drug effective."))) OR ("diseases drug effect."))~.
• Removing quotes may allow a broader search: (((( diseases drugs effectss. ) or ( disease drug effective. ))) or ( diseases drug effect. ))~.
• Adding a wildcard symbol may retrieve word variants: (((("diseases drugs effectss.") or ("disease drug effective."))) or ("diseases drug effect."))*.