Perhaps you should try some spelling variations:
development development » development developing, development environment
social economic » socio economic, social economy, social ecological
legal economic » local economic, global economic, regional economic
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 ((legal economic) OR (social economic)) AND ((development development) OR (environment development)) (leed) working papers.
• Adding a wildcard symbol may retrieve word variants: oecd ((legal economic) or (social economic)) and ((development development) or (environment development)) (leed) working papers*.