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 _ugs effectss."
"diseases due effect." » "diseases drug effect.", "diseases diet effect.", "diseases case effect.", "diseases dose effect.", "diseases edge effect.", "diseases age effect."
"diseases dr effect." » "diseases do effect.", "diseases drug effect.", "diseases _ 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 due effect."))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("diseases drugs effectss.") OR ((("diseases dr effect.") OR ("diseases due effect.")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"diseases drugs effectss.\") or (((\"diseases dr effect.\") OR (\"diseases due effect.\"))))".
• Removing quotes may allow a broader search: (( diseases drugs effectss. ) or ((( diseases dr effect. ) OR ( diseases due effect. )))).
• Adding a wildcard symbol may retrieve word variants: (("diseases drugs effectss.") or ((("diseases dr effect.") OR ("diseases due effect."))))*.