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