Perhaps you should try some spelling variations:
"based development concept working papers" » "based development concepts working papers", "based development context working papers", "based development control working papers", "based development content working papers", "based development concept working paper"
"oecd development hot working papers" » "child development hot working papers", "oriented development hot working papers", "oecd development host working papers", "oecd development how working papers", "oecd development http working papers", "oecd development hot working paper", "oecd development net working papers", "oecd development set working papers", "oecd development joint working papers"

Try widening your search to All Fields.

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: (("based development concept working papers") OR ("oecd development hot working papers")).
• Removing quotes may allow a broader search: (( based development concept working papers ) or ( oecd development hot working papers )).
• Adding a wildcard symbol may retrieve word variants: (("based development concept working papers") or ("oecd development hot working papers"))*.