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

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 effect.") OR ("diseases drug effect."))))~.
• Removing quotes may allow a broader search: (( diseases dna effects. ) or ((( diseases drag effect. ) or ( diseases drug effect. ))))~.
• Adding a wildcard symbol may retrieve word variants: (("diseases dna effects.") or ((("diseases drag effect.") or ("diseases drug effect."))))*.