Perhaps you should try some spelling variations:
"oecd economics department working paper" » "oecd economics development working paper", "oecd economics experiments working paper", "oecd economics management working paper", "oecd economics departments working paper", "oecd economics department boarding paper", "oecd economics department nursing paper", "oecd economic department working paper", "oecd economies department working paper", "sound economics department working paper"
"world economics department working paper" » "world economics development working paper", "world economics experiments working paper", "world economics management working paper", "world economics departments working paper", "world economics department boarding paper", "world economics department nursing paper", "world economic department working paper", "world economies department working paper", "world economy department working paper"
"oecd economics department working papers" » "oecd economics development working papers", "oecd economics experiments working papers", "oecd economics management working papers", "oecd economics departments working papers", "oecd economics department boarding papers", "oecd economics department nursing papers", "oecd economic department working papers", "oecd economies department working papers", "sound economics department working papers"
"kcd economics department working paper" » "kcd economics development working paper", "kcd economics experiments working paper", "kcd economics management working paper", "kcd economics departments working paper", "kcd economics department boarding paper", "kcd economics department nursing paper", "oecd economies department working paper", "land economics department working paper", "food economics department 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 department working paper") OR ("world economics department working paper"))) OR ("oecd economics department working papers"))) OR ("kcd economics department working paper")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"oecd economics department working paper\") OR (\"world economics department working paper\"))) or (\"oecd economics department working papers\"))) or (\"kcd economics department working paper\"))".
• Removing quotes may allow a broader search: (((((( oecd economics department working paper ) OR ( world economics department working paper ))) or ( oecd economics department working papers ))) or ( kcd economics department working paper )).
• Adding a wildcard symbol may retrieve word variants: (((((("oecd economics department working paper") OR ("world economics department working paper"))) or ("oecd economics department working papers"))) or ("kcd economics department working paper"))*.