Perhaps you should try some spelling variations:
"oecd economics experiments working papers" » "oecd economic experiments working papers", "oecd proteomics experiments working papers", "oecd dynamics experiments working papers", "oecd economics experiments during papers", "oecd economics experiments modeling papers", "oecd economics experiments tending papers", "oecd economies experiments working papers", "world economics experiments working papers"
"oecd economics departments working papers" » "oecd economics department working papers", "oecd economics payments working papers", "oecd economics developments working papers", "oecd economics departments wrong papers", "oecd economics department nursing papers", "oecd economic departments working papers", "oecd economies departments working papers", "world economics departments working papers"
"oecd economics departments working paper" » "oecd economics department working paper", "oecd economics payments working paper", "oecd economics developments working paper", "oecd economics departments wrong paper", "oecd economics department nursing paper", "oecd economic departments working paper", "oecd economies departments working paper", "world economics departments working paper"
"kcd economics departments working papers" » "kcd economics department working papers", "kcd economics payments working papers", "kcd economics developments working papers", "kcd economics departments wrong papers", "kcd economics department nursing papers", "oecd economies departments working papers", "land economics departments working papers", "food economics 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 economics departments working papers") OR ("oecd economics departments working paper"))) OR ("kcd economics departments working papers"))) OR ("oecd economics experiments 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 ("kcd economics departments working papers"))) or ("oecd economics experiments working papers"))*.