Perhaps you should try some spelling variations:
regional economic » regional economics
special economic » spatial economics
social economic » socio economic, social economy, social ecological
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 ((((special economic) OR (social economic))) OR (regional economic)) AND employee development (leed) working papers.
• The words AND, OR and NOT may confuse the search; try adding quotes: "oecd ((((special economic) OR (social economic))) or (regional economic)) and employee development (leed) working papers".
• Adding a wildcard symbol may retrieve word variants: oecd ((((special economic) OR (social economic))) or (regional economic)) and employee development (leed) working papers*.