Perhaps you should try some spelling variations:
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"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", "sound economics departments working papers", "land economics departments working papers", "oecd economics departments working paper", "world 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", "world economics 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", "world economic 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 ("world 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 (\"world 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 ( world 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 ("world economics departments working papers"))) or ("oecd economies departments working papers"))) or ("oecd economic departments working papers"))*.