Perhaps you should try some spelling variations:
"oecd economics department working paper" » "oecd economics development working paper", "oecd economics experiments working paper", "oecd economics government working paper", "oecd economics departments working paper", "oecd economics department work paper", "oecd economics department solving 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 government 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"
"oecd economics department nursing paper" » "oecd economics development nursing paper", "oecd economics experiments nursing paper", "oecd economics government nursing paper", "oecd economics department guessing paper", "oecd economics departments using paper", "oecd economics department building paper", "oecd economic department nursing paper", "oecd economies department nursing paper", "world economics department nursing paper", "oecd economics department nursing chapter", "oecd economics department nursing career", "oecd economics department nursing cancer"
"kcd economics management working paper" » "kcd economics management work paper", "kcd economics management workshops paper", "oecd economies management working paper", "land economics management working paper", "food economics management 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 department boarding paper"))) OR ("oecd economics department nursing paper"))) OR ("kcd economics management working paper")).
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• Adding a wildcard symbol may retrieve word variants: (((((("oecd economics department working paper") OR ("oecd economics department boarding paper"))) or ("oecd economics department nursing paper"))) or ("kcd economics management working paper"))*.