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