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 departments working papers", "oecd economic department boarding papers", "oecd economic department nursing 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 departments working paper", "oecd economic department boarding paper", "oecd economic department nursing paper", "world 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 nursing papers", "lead academic department working papers", "world academic department working papers", "board academic department working papers"
"second academic department working papers" » "second academic departments working papers", "second academic patent working papers", "second academic development working papers", "second academic department boarding papers", "second academic department nursing papers", "beyond academic department working papers", "secondary academic department working papers", "beyond academia 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 ("second academic department working papers"))))) OR ("oecd economic department working paper")).
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• Adding a wildcard symbol may retrieve word variants: (((("oecd economic department working papers") or ((("oecd academic department working papers") OR ("second academic department working papers"))))) or ("oecd economic department working paper"))*.