Perhaps you should try some spelling variations:
environment development » development development
employment development » employee development, development development, employment unemployment
special economic » social economic, spatial economics
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 (special economic)) AND ((employment development) OR (environment development)) (leed) working papers.
• Adding a wildcard symbol may retrieve word variants: oecd ((legal economic) or (special economic)) and ((employment development) or (environment development)) (leed) working papers*.