Perhaps you should try some spelling variations:
"oecd economics departments working papers" » "oecd economics department working papers", "oecd economics experiments working papers", "oecd economics payments working papers", "oecd economics departments wrong papers", "oecd economics department nursing papers", "kcd economics departments working papers", "world economics departments working papers", "sound economics departments working papers"
"oecd economics departments working paper" » "oecd economics department working paper", "oecd economics experiments working paper", "oecd economics payments working paper", "oecd economics departments wrong paper", "oecd economics department nursing paper", "kcd economics departments working paper", "world economics departments working paper", "sound economics departments working paper"
"oecd economies departments working papers" » "oecd economics department working papers", "oecd economies developments working papers", "oecd colleges departments working papers", "oecd economies department working papers", "oecd economies departments wrong papers", "oecd economies department nursing papers"
"oecd economic departments working papers" » "oecd economics department working papers", "oecd economic experiments working papers", "oecd academic departments working papers", "oecd economic department working papers", "oecd economic departments wrong papers", "oecd economic department nursing papers"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (((((("oecd economics departments working papers") OR ("oecd economics departments working paper"))) OR ("oecd economies departments working papers"))) OR ("oecd economic departments working papers")).
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• Adding a wildcard symbol may retrieve word variants: (((((("oecd economics departments working papers") OR ("oecd economics departments working paper"))) or ("oecd economies departments working papers"))) or ("oecd economic departments working papers"))*.