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