Perhaps you should try some spelling variations:
"oecd economic departments working papers" » "oecd economics department working papers", "oecd economic experiments working papers", "oecd academic departments working papers", "oecd economics departments working papers", "oecd economic debasements working papers", "oecd economic departments wrong papers", "oecd economic department nursing papers", "oecd economic department work papers", "oecd economic departments working paper"
"oecd economic department working papers" » "oecd economics department working papers", "oecd economic debasement working papers", "oecd academic department working papers", "oecd economic department boarding papers", "oecd economic department nursing papers", "oecd economic department work papers", "oecd economic department working paper"
"oecd economics management working papers" » "oecd economics management work papers", "oecd economics management workshops papers", "oecd economics management working paper", "oecd economies management working papers", "kcd economics management working papers", "world economics management working papers"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (((("oecd economic department working papers") OR ("oecd economic departments working papers"))) OR ("oecd economics management working papers"))*.
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• Removing quotes may allow a broader search: (((( oecd economic department working papers ) OR ( oecd economic departments working papers ))) or ( oecd economics management working papers ))*.