Perhaps you should try some spelling variations:
"diseases drug effectss." » "diseases drug effects.", "diseases drug effectors.", "diseases drugs effects."
"diseases drag effect." » "diseases drugs effect.", "diseases dr effect.", "diseases during effect.", "diseases drag effects.", "diseases dag effect.", "diseases dung effect."
"diseases dna effect." » "disease dna effect.", "diseases donna effect.", "diseases dhea effect.", "diseases a effect.", "diseases ia effect.", "diseases kra effect."

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

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