Perhaps you should try some spelling variations:
"oecd economics development working paper" » "oecd economic development working paper", "oecd economic developments working paper", "oecd economics development work paper", "oecd economics development workflow paper", "oecd economics development within paper", "oecd economies development working paper", "world economics development working paper"
"oecd economics department working paper" » "oecd economics experiments working paper", "oecd economics management working paper", "oecd economics government working paper", "oecd economics departments working paper", "oecd economics department boarding paper", "oecd economics department work paper", "oecd economic department working paper", "oecd economies department working paper", "world economics department working paper"
"oecd economics department nursing paper" » "oecd economics experiments nursing paper", "oecd economics management nursing paper", "oecd economics government nursing paper", "oecd economics department guessing paper", "oecd economics departments using paper", "oecd economics department boarding paper", "oecd economic department nursing paper", "oecd economies department nursing paper", "world economics department nursing paper", "oecd economics department nursing peer", "oecd economics department nursing chapter", "oecd economics department nursing career"
"kcd economics department working paper" » "kcd economics experiments working paper", "kcd economics management working paper", "kcd economics government working paper", "kcd economics departments working paper", "kcd economics department boarding paper", "kcd economics department work paper", "oecd economies department working paper", "land economics department working paper", "food economics department working paper"

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 development working paper"))) OR ("oecd economics department nursing paper"))) OR ("kcd economics department working paper")).
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• Adding a wildcard symbol may retrieve word variants: (((((("oecd economics department working paper") OR ("oecd economics development working paper"))) or ("oecd economics department nursing paper"))) or ("kcd economics department working paper"))*.