Perhaps you should try some spelling variations:
"world bank chief economists" » "world bank chief economist", "world bank how economists", "world bank can economists", "world beck chief economists", "world bank chinese economists"
"world best women economists" » "world best modern economists", "world best women economic", "world best women chemists", "world's best women economists", "world better women economists", "world beat women economists", "world best workmen economists", "world obese women economists"

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