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

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