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