Perhaps you should try some spelling variations:
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"oecd economics department working papers" » "oecd economics experiments 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 work papers", "oecd economics department working paper", "oecd economies department working papers", "kcd economics department working papers", "world economics department working papers"
"oecd economics department nursing papers" » "oecd economics experiments nursing papers", "oecd economics management nursing papers", "oecd economics government nursing papers", "oecd economics department guessing papers", "oecd economics departments using papers", "oecd economics department building papers", "oecd economies department nursing papers", "kcd economics department nursing papers", "world economics department nursing papers", "oecd economics department using papers", "oecd economics department nursing fathers", "oecd economics department nursing experts"
"oecd economic department working papers" » "oecd economic debasement working papers", "oecd academic department working papers", "oecd economic experiment working papers", "oecd economic departments working papers", "oecd economic department boarding papers", "oecd economic department work papers", "oecd economic 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 economic department working papers") OR ((((("oecd economics department working papers") OR ("oecd economics department nursing papers"))) OR ("oecd economics development nursing papers")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"oecd economic department working papers\") or (((((\"oecd economics department working papers\") OR (\"oecd economics department nursing papers\"))) or (\"oecd economics development nursing papers\"))))".
• Removing quotes may allow a broader search: (( oecd economic department working papers ) or ((((( oecd economics department working papers ) OR ( oecd economics department nursing papers ))) or ( oecd economics development nursing papers )))).
• Adding a wildcard symbol may retrieve word variants: (("oecd economic department working papers") or ((((("oecd economics department working papers") OR ("oecd economics department nursing papers"))) or ("oecd economics development nursing papers"))))*.