Perhaps you should try some spelling variations:
chief economists » chief economist, how economists, women economists
modern economic » modern economy, modeling economic
world black » worlds black, world back, world lack
bank chief » beck chief, bank chinese
world beck » world back, world best, world book

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) OR (world black)) ((modern economic) OR (models economic)) ))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( world bank chief economists ) or ( ((world beck) or (world black)) ((modern economic) OR (models economic)) ))*".