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

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 back)) modern economists )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( world bank chief economists ) or ( ((world beck) OR (world back)) modern economists ))".
• Adding a wildcard symbol may retrieve word variants: (( world bank chief economists ) or ( ((world beck) OR (world back)) modern economists ))*.