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."

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("disease drugs effectss.") OR ("disease drugs effects."))) or ("diseases drug effect."))~.
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• Adding a wildcard symbol may retrieve word variants: (((("disease drugs effectss.") OR ("disease drugs effects."))) or ("diseases drug effect."))*.