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