Perhaps you should try some spelling variations:
"diseases drugugs effectss." » "diseases drug effectss.", "disease drugs effectss.", "diseases douglas effectss.", "diseases drugs effects.", "diseases drug effects.", "diseases dougugs effectss.", "diseases drugugugs effectss.", "diseases dueugugs effectss."
"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 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 drugugs effectss."))) or ("diseases dr effect."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("diseases drugs effectss.") OR ("diseases drugugs effectss."))) OR ("diseases dr effect.")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"diseases drugs effectss.\") OR (\"diseases drugugs effectss.\"))) or (\"diseases dr effect.\"))".
• Removing quotes may allow a broader search: (((( diseases drugs effectss. ) OR ( diseases drugugs effectss. ))) or ( diseases dr effect. )).
• Adding a wildcard symbol may retrieve word variants: (((("diseases drugs effectss.") OR ("diseases drugugs effectss."))) or ("diseases dr effect."))*.