Perhaps you should try some spelling variations:
economic departments » economics department, economic experiments, academic departments
departments working » department working, departments wrong, department nursing
oecd economics » oecd economies, kcd economics, world economics
working papers » working paper

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: (( ((oecd economics) OR (oecd economic)) departments working papers ) OR ( world economic departments working papers )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( ((oecd economics) OR (oecd economic)) departments working papers ) or ( world economic departments working papers ))".
• Adding a wildcard symbol may retrieve word variants: (( ((oecd economics) OR (oecd economic)) departments working papers ) or ( world economic departments working papers ))*.