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