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