Perhaps you should try some spelling variations:
"diseases drag effects." » "diseases drug effects.", "diseases drugs effects.", "diseases dr 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."
"diseases dag effect." » "diseases drug effect.", "diseases dale effect.", "diseases dogs effect.", "diseases drag effect.", "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 effects.") OR ((("diseases drag effects.") OR ("diseases dag effect."))))~.
• Removing quotes may allow a broader search: (( diseases dna effects. ) or ((( diseases drag effects. ) or ( diseases dag effect. ))))~.
• Adding a wildcard symbol may retrieve word variants: (("diseases dna effects.") or ((("diseases drag effects.") or ("diseases dag effect."))))*.