Perhaps you should try some spelling variations:
"oecd economics department working papers" » "oecd economics development working papers", "oecd economics experiments working papers", "oecd economics government working papers", "oecd economics departments working papers", "oecd economics department boarding papers", "oecd economics department nursing papers", "oecd economics department working paper", "oecd economies department working papers", "kcd economics department working papers", "world economics department working papers"
"oecd economic experiment working papers" » "oecd economic experiments working papers", "oecd economics experiments working papers", "oecd economic empowerment working papers", "oecd economic experimental working papers", "oecd economic experiment wirkung papers", "oecd economic experiment working paper"
"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 nursing papers", "oecd academic department working paper", "lead academic department working papers", "second academic department working papers", "world academic department working papers"
"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"

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 experiment working papers") OR ("oecd academic department working papers"))) OR ((("oecd economics department working papers") OR ("oecd economics management working papers")))).
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• Adding a wildcard symbol may retrieve word variants: (((("oecd economic experiment working papers") or ("oecd academic department working papers"))) or ((("oecd economics department working papers") OR ("oecd economics management working papers"))))*.