Perhaps you should try some spelling variations:
"diseases xdrugs affects." » "diseases drugs affects.", "disease drugs affects.", "disease drug affects.", "diseases drugs effects.", "diseases xdrug effects.", "diseases drugs affect."
"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 xdrugs affects.") OR ("diseases drug effects."))) OR ("diseases drug effect."))~.
• Removing quotes may allow a broader search: (((( diseases xdrugs affects. ) or ( diseases drug effects. ))) or ( diseases drug effect. ))~.
• Adding a wildcard symbol may retrieve word variants: (((("diseases xdrugs affects.") or ("diseases drug effects."))) or ("diseases drug effect."))*.