Perhaps you should try some spelling variations:
"diseases drugs effectss." » "diseases drug effectss.", "disease drugs effectss.", "disease drug effectss.", "diseases drug effects.", "diseases drugs effective.", "diseases drug effectors.", "diseases xdrug effectss.", "diseases drugs effectives."
"diseases drugs effects." » "diseases drug effects.", "disease drugs effects.", "disease drug effects.", "diseases xdrug effects.", "diseases drugs effective."
"diseases due effect." » "diseases drug effect.", "diseases diet effect.", "diseases case effect.", "diseases dose effect.", "diseases edge effect.", "diseases age effect."

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("diseases drugs effectss.") OR ("diseases drugs effects."))) or ("diseases due effect."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("diseases drugs effectss.") OR ("diseases drugs effects."))) OR ("diseases due effect.")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"diseases drugs effectss.\") OR (\"diseases drugs effects.\"))) or (\"diseases due effect.\"))".
• Removing quotes may allow a broader search: (((( diseases drugs effectss. ) OR ( diseases drugs effects. ))) or ( diseases due effect. )).
• Adding a wildcard symbol may retrieve word variants: (((("diseases drugs effectss.") OR ("diseases drugs effects."))) or ("diseases due effect."))*.