Perhaps you should try some spelling variations:
"diseases drug effectss." » "diseases drug effects.", "diseases drug effectors.", "diseases drugs effects."
"diseases dhea effects." » "diseases diet effects.", "diseases due effects.", "diseases heat effects.", "diseases data effects.", "diseases sea effects.", "diseases area effects."
"diseases dna effects." » "disease dna effects.", "diseases donna effects.", "diseases a effects.", "diseases dna effect.", "diseases data effects.", "diseases cla effects."

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (("diseases drug effectss.") or ((("diseases dna effects.") or ("diseases dhea effects."))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("diseases drug effectss.") OR ((("diseases dna effects.") OR ("diseases dhea effects.")))).
• Removing quotes may allow a broader search: (( diseases drug effectss. ) or ((( diseases dna effects. ) or ( diseases dhea effects. )))).
• Adding a wildcard symbol may retrieve word variants: (("diseases drug effectss.") or ((("diseases dna effects.") or ("diseases dhea effects."))))*.