Perhaps you should try some spelling variations:
"diseases dna effects." » "disease dna effects.", "diseases donna effects.", "diseases dhea effects.", "diseases dna effect.", "diseases data effects.", "diseases sea effects."
"diseases cla effects." » "diseases cell effects.", "diseases chap effects.", "diseases ch effects.", "diseases sea effects.", "diseases china effects.", "diseases data effects."
"diseases drug effect." » "diseases drug effects.", "diseases drag effect.", "diseases drugs 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 cla effects."))) OR ("diseases drug effect."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"diseases dna effects.\") OR (\"diseases cla effects.\"))) or (\"diseases drug effect.\"))~".
• Removing quotes may allow a broader search: (((( diseases dna effects. ) OR ( diseases cla effects. ))) or ( diseases drug effect. ))~.
• Adding a wildcard symbol may retrieve word variants: (((("diseases dna effects.") OR ("diseases cla effects."))) or ("diseases drug effect."))*.