Perhaps you should try some spelling variations:
environment development » development development
employment development » development development, employment unemployment, component development
regional economic » regional economics
legal economic » local economic, global economic, special 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 (regional economic)) AND ((((employment development) OR (environment development))) OR (employee development)) (leed) working papers.
• The words AND, OR and NOT may confuse the search; try adding quotes: "oecd ((legal economic) or (regional economic)) and ((((employment development) OR (environment development))) or (employee development)) (leed) working papers".
• Adding a wildcard symbol may retrieve word variants: oecd ((legal economic) or (regional economic)) and ((((employment development) OR (environment development))) or (employee development)) (leed) working papers*.