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

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 _ healthy adults")).
• 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 _ healthy adults\"))".
• Removing quotes may allow a broader search: (((((( cost of _ healthy dies ) OR ( cost of _ healthy diets ))) or ( cost of _ healthy diet ))) or ( cost of _ healthy adults )).
• 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 _ healthy adults"))*.