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