Perhaps you should try some spelling variations:
"diseases dhea effect." » "diseases diet effect.", "diseases due effect.", "diseases de effect.", "diseases wheat effect.", "diseases shear effect.", "diseases dna effect."
"diseases heat effect." » "disease heat effect.", "diseases health effect.", "diseases great effect.", "diseases heart effect.", "diseases wheat effect."
"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 dhea effect.") OR ("diseases heat effect."))) OR ("diseases drug effect."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"diseases dhea effect.\") OR (\"diseases heat effect.\"))) or (\"diseases drug effect.\"))~".
• Removing quotes may allow a broader search: (((( diseases dhea effect. ) OR ( diseases heat effect. ))) or ( diseases drug effect. ))~.
• Adding a wildcard symbol may retrieve word variants: (((("diseases dhea effect.") OR ("diseases heat effect."))) or ("diseases drug effect."))*.