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