Perhaps you should try some spelling variations:
"kcd economics development working paper" » "kcd economic development working paper", "kcd economic developments working paper", "kcd economics development work paper", "kcd economics development workflow paper", "kcd economics development within paper", "oecd economies development working paper", "land economics development working paper", "food economics development working paper"
"oecd economics department boarding paper" » "oecd economics experiments boarding paper", "oecd economics management boarding paper", "oecd economics investment boarding paper", "oecd economics department building paper", "oecd economics department cardiac paper", "oecd economics department imaging paper", "oecd economic department boarding paper", "oecd economies department boarding paper", "world economics department boarding paper", "oecd economics department boarding passes", "oecd economics department boarding pass", "oecd economics department folding paper"
"kcd economics department working paper" » "kcd economics experiments working paper", "kcd economics management working paper", "kcd economics investment working paper", "kcd economics departments working paper", "kcd economics department nursing paper", "kcd economics department work paper", "oecd economies department working paper", "land economics department working paper", "food economics department working paper"
"oecd economics government boarding paper" » "oecd politics government boarding paper", "oecd economics government borrowing paper", "oecd economics government regarding paper", "oecd economics government board paper", "oecd economic government boarding paper", "oecd economies government boarding paper", "world economics government boarding paper", "oecd economics government boarding passes", "oecd economics government boarding pass", "oecd economics government folding 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 boarding paper") OR ("oecd economics government boarding paper"))) OR ((("kcd economics department working paper") OR ("kcd economics development working paper")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"oecd economics department boarding paper\") OR (\"oecd economics government boarding paper\"))) or (((\"kcd economics department working paper\") or (\"kcd economics development working paper\"))))".
• Removing quotes may allow a broader search: (((( oecd economics department boarding paper ) OR ( oecd economics government boarding paper ))) or ((( kcd economics department working paper ) or ( kcd economics development working paper )))).
• Adding a wildcard symbol may retrieve word variants: (((("oecd economics department boarding paper") OR ("oecd economics government boarding paper"))) or ((("kcd economics department working paper") or ("kcd economics development working paper"))))*.