Perhaps you should try some spelling variations:
"diseases drugs effectss." » "disease drugs effectss.", "disease drug effectss.", "diseases douglas effectss.", "diseases drugs effects.", "diseases drug effects.", "diseases drugs effective."
"diseases dogs effectss." » "diseases do effectss.", "diseases down effectss.", "diseases douglas effectss.", "diseases dogs effect.", "diseases logs effects.", "diseases drugs effects."
"diseases drug effect." » "diseases drug effects.", "diseases drag effect.", "diseases drugs effects."

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