Perhaps you should try some spelling variations:
"oecd economic department working papers" » "oecd economics department working papers", "oecd economic debasement working papers", "oecd economic experiment working papers", "oecd economic department boarding papers", "oecd economic department nursing papers", "oecd economic department work papers", "world economic department working papers"
"oecd economic department working paper" » "oecd economics department working paper", "oecd economic debasement working paper", "oecd economic experiment working paper", "oecd economic department boarding paper", "oecd economic department nursing paper", "oecd economic department work paper", "world economic department working paper"
"lead academic department working papers" » "lead academic patent working papers", "lead academic development working papers", "lead academic department boarding papers", "lead academic department nursing papers", "lead academic department work papers", "learn academic department working papers", "leave academic department working papers", "bad academic department working papers"
"oecd academic departments working papers" » "oecd academic patents working papers", "oecd academic developments working papers", "oecd academic departments wrong papers", "oecd academic department boarding papers", "oecd academic department nursing papers", "second academic departments working papers", "world academic departments working papers", "board academic departments 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 ((("lead academic department working papers") OR ("oecd academic departments working papers"))))) OR ("oecd economic department working paper")).
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