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

Try widening your search to All Fields.

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