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 boarding papers", "oecd economics department work papers", "oecd economics department working paper", "oecd economies department working papers", "kcd economics department working papers", "world economics department working papers"
"oecd economics department nursing papers" » "oecd economics development nursing papers", "oecd economics experiments nursing papers", "oecd economics management nursing papers", "oecd economics department guessing papers", "oecd economics departments using papers", "oecd economics department building papers", "oecd economies department nursing papers", "kcd economics department nursing papers", "world economics department nursing papers", "oecd economics department using papers", "oecd economics department nursing fathers", "oecd economics department nursing experts"
"oecd economic department working papers" » "oecd economic debasement working papers", "oecd economic experiment working papers", "oecd economic treatment working papers", "oecd economic departments working papers", "oecd economic department boarding papers", "oecd economic department work papers", "oecd economic department working paper", "world economic department working papers"
"oecd academic department working papers" » "oecd academic departments working papers", "oecd academic patent working papers", "oecd academic development working papers", "oecd academic department boarding papers", "oecd academic department work papers", "oecd academic department working paper", "lead academic department working papers", "second academic department working papers", "world academic 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 economic department working papers") OR ("oecd academic department working papers"))) OR ((("oecd economics department working papers") OR ("oecd economics department nursing papers")))).
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• Adding a wildcard symbol may retrieve word variants: (((("oecd economic department working papers") or ("oecd academic department working papers"))) or ((("oecd economics department working papers") OR ("oecd economics department nursing papers"))))*.