Perhaps you should try some spelling variations:
"cost of a healthy adult" » "cost of a healthy adults", "cost of a healthy diet", "cost of _ healthy adult"
"cost of a health does" » "cost of a health do", "cost of a health diet", "cost of a health deep"

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: (("cost of a health does") OR ("cost of a healthy adult")).
• Removing quotes may allow a broader search: (( cost of a health does ) or ( cost of a healthy adult )).
• Adding a wildcard symbol may retrieve word variants: (("cost of a health does") or ("cost of a healthy adult"))*.