Perhaps you should try some spelling variations:
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"oecd economic departments working papers" » "oecd economic experiments working papers", "oecd academic departments working papers", "oecd economic debasement working papers", "oecd economic department nursing papers", "oecd economic department work papers", "oecd economic departments within papers"
"oecd economic departments using papers" » "oecd economic experiments using papers", "oecd academic departments using papers", "oecd economic debasement using papers", "oecd economic compartments using papers", "oecd economic department nursing papers", "oecd economic departments auditing papers", "oecd economic departments using paper", "oecd economic departments using panels", "oecd economic departments being papers"
"oecd economic departments wrong papers" » "oecd economic experiments wrong papers", "oecd academic departments wrong papers", "oecd economic debasement wrong papers", "oecd economic department long papers", "oecd economic departments from papers", "oecd economic departments one papers", "oecd economic departments long papers", "oecd economic departments kong papers", "oecd economic departments writing 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 economic departments working papers") OR ("oecd economic departments using papers"))) OR ("oecd economic departments wrong papers"))) OR ("oecd economics department working paper")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"oecd economic departments working papers\") OR (\"oecd economic departments using papers\"))) or (\"oecd economic departments wrong papers\"))) or (\"oecd economics department working paper\"))".
• Removing quotes may allow a broader search: (((((( oecd economic departments working papers ) OR ( oecd economic departments using papers ))) or ( oecd economic departments wrong papers ))) or ( oecd economics department working paper )).
• Adding a wildcard symbol may retrieve word variants: (((((("oecd economic departments working papers") OR ("oecd economic departments using papers"))) or ("oecd economic departments wrong papers"))) or ("oecd economics department working paper"))*.