Perhaps you should try some spelling variations:
employment development » development development, environment development, employment unemployment
regional economic » regional economics
working papers » working paper
oecd regional » oecd regions, world regional, chad regional

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 regional economic AND ((employment development) OR (employee development)) (leed) working papers.
• Adding a wildcard symbol may retrieve word variants: oecd regional economic and ((employment development) or (employee development)) (leed) working papers*.