Perhaps you should try some spelling variations:
"diseases drugs effectss." » "diseases drug effectss.", "disease drugs effectss.", "disease drug effectss.", "diseases drugs effects.", "diseases drug effects.", "diseases drugs effective.", "diseases dougs effectss.", "diseases drugugs effectss.", "diseases dueugs effectss."
"diseases eye effect." » "diseases elke effect.", "diseases case effect.", "diseases ebps effect.", "diseases eae effect.", "diseases ewe effect.", "diseases edge effect."
"diseases dr effect." » "diseases do effect.", "diseases drug effect.", "diseases due effect.", "diseases gr effect.", "diseases mr effect.", "diseases deer effect."

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