Perhaps you should try some spelling variations:
economics department » economics development, economics experiments, economics government
management loading » management leading, management locating, management looking
oecd economics » oecd economic, oecd economies, kcd economics
loading pass » loading mass, loading paths, loading phase

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