Perhaps you should try some spelling variations:
"world bank chief economists" » "world bank how economists", "world bank women economists", "world bank can economists", "world bank chinese economists"
"world beck chief economist" » "world back chief economist", "world black chief economist", "world best chief economist"

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: (("world bank chief economists") OR ("world beck chief economist")).
• Removing quotes may allow a broader search: (( world bank chief economists ) or ( world beck chief economist )).
• Adding a wildcard symbol may retrieve word variants: (("world bank chief economists") or ("world beck chief economist"))*.