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