Perhaps you should try some spelling variations:
"diseases drug effectss." » "diseases drug effects.", "diseases drug effectors.", "diseases drugs effects."
"diseases drag effects." » "diseases drugs effects.", "diseases dr effects.", "diseases during effects.", "diseases drug effects.", "diseases drag effect.", "diseases xdrug effects."
"diseases dna effects." » "disease dna effects.", "diseases donna effects.", "diseases dhea effects.", "diseases dna effect.", "diseases data effects.", "diseases cla effects."

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