Perhaps you should try some spelling variations:
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"oecd economics department working paper" » "oecd economics development working paper", "oecd economics experiments working paper", "oecd economics management working paper", "oecd economics department boarding paper", "oecd economics department nursing paper", "oecd economics department work paper", "oecd economies department working paper", "world economics department working paper", "sound economics department working paper"
"kcd economics department working paper" » "kcd economics development working paper", "kcd economics experiments working paper", "kcd economics management working paper", "kcd economics department boarding 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"
"oecd economic department guessing papers" » "oecd economic debasement guessing papers", "oecd academic department guessing papers", "oecd economic experiment guessing papers", "oecd economic department getting papers", "oecd economic department nursing papers", "oecd economic department building papers", "oecd economic department guessing games", "oecd economic department using papers", "oecd economic department guessing names"

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 economic departments working papers") OR ("oecd economic department guessing papers"))) OR ((("oecd economics department working paper") OR ("kcd economics department working paper")))).
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• Adding a wildcard symbol may retrieve word variants: (((("oecd economic departments working papers") or ("oecd economic department guessing papers"))) or ((("oecd economics department working paper") OR ("kcd economics department working paper"))))*.