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 mans economic"
"world sick man economic" » "world sick main economic", "world sick human economic", "world sick roman economic", "world since man economic", "world six man economic", "world si man economic", "world sick man's 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") OR ("world sick man economic")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"world bank chief economists\") or (((\"world sick mena economic\") OR (\"world sick man economic\"))))".
• Removing quotes may allow a broader search: (( world bank chief economists ) or ((( world sick mena economic ) OR ( world sick man economic )))).
• Adding a wildcard symbol may retrieve word variants: (("world bank chief economists") or ((("world sick mena economic") OR ("world sick man economic"))))*.