Perhaps you should try some spelling variations:
"cost of _ healthy diets" » "cost of _ healthy adults", "cost of _ healthy city"
"cost of _ healthy dies" » "cost of _ healthy ties", "cost of _ healthy aims", "cost of _ healthy days"
"cost of _ health diet" » "cost of _ health dietary", "cost of _ healthful diet", "cost of _ unhealthy diet"

Try widening your search to All Fields.

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 _ healthy dies") OR ((("cost of _ healthy diets") OR ((("cost of _ healthy diet") OR ("cost of _ health diet")))))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"cost of _ healthy dies\") or (((\"cost of _ healthy diets\") or (((\"cost of _ healthy diet\") OR (\"cost of _ health diet\"))))))".
• Removing quotes may allow a broader search: (( cost of _ healthy dies ) or ((( cost of _ healthy diets ) or ((( cost of _ healthy diet ) OR ( cost of _ health diet )))))).
• Adding a wildcard symbol may retrieve word variants: (("cost of _ healthy dies") or ((("cost of _ healthy diets") or ((("cost of _ healthy diet") OR ("cost of _ health diet"))))))*.