Perhaps you should try some spelling variations:
"oecd economics department working paper" » "oecd economics development working paper", "oecd economics experiments working paper", "oecd economics management working paper", "oecd economics departments working paper", "oecd economics department nursing paper", "oecd economics department work paper", "oecd economic department working paper", "oecd economies department working paper", "world economics department working paper"
"oecd economics department boarding paper" » "oecd economics development boarding paper", "oecd economics experiments boarding paper", "oecd economics management boarding paper", "oecd economics department building paper", "oecd economics department boards paper", "oecd economics department providing paper", "oecd economic department boarding paper", "oecd economies department boarding paper", "world economics department boarding paper", "oecd economics department boarding passes", "oecd economics department boarding pass", "oecd economics department folding paper"
"kcd economics department working paper" » "kcd economics development working paper", "kcd economics experiments working paper", "kcd economics management working paper", "kcd economics departments working paper", "kcd economics department nursing paper", "kcd economics department work paper", "oecd economies department working paper", "land economics department working paper", "food economics department working paper"
"kcd economics department working papers" » "kcd economics development working papers", "kcd economics experiments working papers", "kcd economics management working papers", "kcd economics departments working papers", "kcd economics department nursing papers", "kcd economics department work papers", "oecd economies department working papers", "land economics department working papers", "food economics department working papers"

Try widening your search to All Fields.

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• If you are trying to use Boolean operators, they must be ALL CAPS: (((("oecd economics department working paper") OR ("oecd economics department boarding paper"))) OR ((("kcd economics department working paper") OR ("kcd economics department working papers")))).
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• Removing quotes may allow a broader search: (((( oecd economics department working paper ) OR ( oecd economics department boarding paper ))) or ((( kcd economics department working paper ) or ( kcd economics department working papers )))).
• Adding a wildcard symbol may retrieve word variants: (((("oecd economics department working paper") OR ("oecd economics department boarding paper"))) or ((("kcd economics department working paper") or ("kcd economics department working papers"))))*.