Perhaps you should try some spelling variations:
"diseases drugs effective." » "diseases groups effective.", "diseases drugs affecting.", "diseases davis effective.", "disease drugs effective.", "diseases dogs effective.", "diseases douglas effective."
"disease drug effectss." » "disease drug effects.", "disease drug effectors.", "disease drugs effects.", "disease drug effectsss.", "disease drag effectss.", "disease drugs effectsss."
"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.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("disease drug effectss.") OR ("diseases drugs effective."))) OR ("diseases drug effect."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"disease drug effectss.\") OR (\"diseases drugs effective.\"))) OR (\"diseases drug effect.\"))".
• Removing quotes may allow a broader search: (((( disease drug effectss. ) OR ( diseases drugs effective. ))) OR ( diseases drug effect. )).
• Adding a wildcard symbol may retrieve word variants: (((("disease drug effectss.") OR ("diseases drugs effective."))) OR ("diseases drug effect."))*.