Perhaps you should try some spelling variations:
"world bank how economists" » "world bank how economics", "world bank _ economists", "world bank how economic", "world banks how economists"
"world bank new economics" » "world bank new economic", "world bank law economics", "world bank new economy"

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"world bank new economics\") OR (\"world bank how economists\"))".
• Removing quotes may allow a broader search: (( world bank new economics ) OR ( world bank how economists )).
• Adding a wildcard symbol may retrieve word variants: (("world bank new economics") OR ("world bank how economists"))*.