Perhaps you should try some spelling variations:
"oecd economics department working papers" » "oecd economics development working papers", "oecd economics experiments working papers", "oecd economics management working papers", "oecd economics departments working papers", "oecd economics department nursing papers", "oecd economics department solving papers", "oecd economics department parting papers", "oecd economics department wideing papers", "oecd economics department wiseing papers", "oecd economies department working papers", "kcd economics department working papers", "sound economics department working papers", "oecd economics department working paper"
"world economics department working papers" » "world economics development working papers", "world economics experiments working papers", "world economics management working papers", "world economics departments working papers", "world economics department nursing papers", "world economics department solving papers", "world economic department working papers", "world economies department working papers", "world economy department working papers", "world economics department parting papers", "world economics department wideing papers", "world economics department wiseing papers", "world economics department working paper"
"oecd economics department work papers" » "oecd economics development work papers", "oecd economics experiments work papers", "oecd economics management work papers", "oecd economics department part papers", "oecd economics department wide papers", "oecd economics department wise papers", "oecd economies department work papers", "kcd economics department work papers", "sound economics department work papers", "oecd economics department works papers", "oecd economics department work paper", "oecd economics department york papers"
"oecd economic department boarding papers" » "oecd economic debasement boarding papers", "oecd academic department boarding papers", "oecd economic experiment boarding papers", "oecd economic department building papers", "oecd economic department boards papers", "oecd economic department providing papers", "oecd economic department boarding pass", "oecd economic department boarding passes", "oecd economic department learning 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 papers") OR ("world economics department working papers"))) OR ("oecd economics department work papers"))) OR ("oecd economic department boarding papers")).
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• Adding a wildcard symbol may retrieve word variants: (((((("oecd economics department working papers") OR ("world economics department working papers"))) or ("oecd economics department work papers"))) or ("oecd economic department boarding papers"))*.