Perhaps you should try some spelling variations:
"world bank chief economists" » "world bank chief economist", "world bank how economists", "world bank women economists", "world beck chief economists", "world bank chinese economists"
"world sick mena economic" » "world sick media economic", "world sick kenya economic", "world sick mena economies", "world since mena economic", "world six mena economic", "world si mena economic", "world sick men economic", "world sick men's economic", "world sick man economic"

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