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

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (("diseases dna effect.") OR ((("diseases drag effect.") OR ("diseases dag effect."))))~.
• Removing quotes may allow a broader search: (( diseases dna effect. ) or ((( diseases drag effect. ) or ( diseases dag effect. ))))~.
• Adding a wildcard symbol may retrieve word variants: (("diseases dna effect.") or ((("diseases drag effect.") or ("diseases dag effect."))))*.