Perhaps you should try some spelling variations:
"oecd economics departments working papers" » "oecd economics experiments working papers", "oecd economics payments working papers", "oecd economics developments working papers", "oecd economics experimentss working papers", "oecd economics managements working papers", "oecd economics departments wrong papers", "oecd economics department nursing papers", "oecd economics department work papers", "oecd economic departments working papers", "oecd economies departments working papers", "kcd economics departments working papers", "oecd economics departments working paper"
"world economic departments working papers" » "world economic experiments working papers", "world academic departments working papers", "world economic debasement working papers", "world economic departments wrong papers", "world economic department nursing papers", "world economic department work papers", "world economic departments working paper"
"world economics department working papers" » "world economics development working papers", "world economics experiments working papers", "world economics management working papers", "world economics department boarding papers", "world economics department nursing papers", "world economics department work papers", "world economies department working papers", "world economy department working papers", "food economics department working papers", "world 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 departments working papers") OR ((("world economic departments working papers") OR ("world economics department working papers")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"oecd economics departments working papers\") or (((\"world economic departments working papers\") OR (\"world economics department working papers\"))))".
• Removing quotes may allow a broader search: (( oecd economics departments working papers ) or ((( world economic departments working papers ) OR ( world economics department working papers )))).
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