Perhaps you should try some spelling variations:
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"kcd economics departments working papers" » "kcd economics department working papers", "kcd economics experiments working papers", "kcd economics payments working papers", "kcd economics departments wrong papers", "kcd economics department nursing papers", "kcd economics departments working paper", "land economics departments working papers", "food economics departments working papers", "grid economics departments working papers"
"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 economies departments working paper"
"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", "oecd economic departments working paper"

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 ("kcd economics departments working papers"))) OR ("oecd economies departments working papers"))) OR ("oecd economic departments working papers")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"oecd economics departments working papers\") OR (\"kcd economics departments working papers\"))) or (\"oecd economies departments working papers\"))) or (\"oecd economic departments working papers\"))".
• Removing quotes may allow a broader search: (((((( oecd economics departments working papers ) OR ( kcd economics departments working papers ))) or ( oecd economies departments working papers ))) or ( oecd economic departments working papers )).
• Adding a wildcard symbol may retrieve word variants: (((((("oecd economics departments working papers") OR ("kcd economics departments working papers"))) or ("oecd economies departments working papers"))) or ("oecd economic departments working papers"))*.