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 economies departments working papers", "kcd economics departments working papers", "sound economics departments working papers", "oecd economics departments working paper"
"oecd economics department working papers" » "oecd economics development working papers", "oecd economics experiments working papers", "oecd economics management working papers", "oecd economics department nursing papers", "oecd economics department work papers", "oecd economics department solving papers", "oecd economies department working papers", "kcd economics department working papers", "sound economics department working papers", "oecd economics department 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 nursing papers", "world economics department work papers", "world economics department solving papers", "world economic department working papers", "world economy department working papers", "food economics department working papers", "world economics department working paper"
"oecd economic department boarding papers" » "oecd economic debasement boarding papers", "oecd academic department boarding papers", "oecd economic experiment boarding papers", "oecd economic department building papers", "oecd economic department boards papers", "oecd economic department providing papers", "oecd economic department boarding pass", "oecd economic department boarding passes", "oecd economic department learning 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 papers") OR ("world economics department working papers"))) OR ("oecd economics departments working papers"))) OR ("oecd economic department boarding papers")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"oecd economics department working papers\") OR (\"world economics department working papers\"))) or (\"oecd economics departments working papers\"))) or (\"oecd economic department boarding papers\"))".
• Removing quotes may allow a broader search: (((((( oecd economics department working papers ) OR ( world economics department working papers ))) or ( oecd economics departments working papers ))) or ( oecd economic department boarding papers )).
• Adding a wildcard symbol may retrieve word variants: (((((("oecd economics department working papers") OR ("world economics department working papers"))) or ("oecd economics departments working papers"))) or ("oecd economic department boarding papers"))*.