Perhaps you should try some spelling variations:
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"oecd economies department working papers" » "oecd economics department working papers", "oecd technologies department working papers", "oecd economies development working papers", "oecd economies departments working papers", "oecd economies department boarding papers", "oecd economies department work papers"
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• If you are trying to use Boolean operators, they must be ALL CAPS: (((("oecd economies department working paper") OR ((("oecd economies department working papers") OR ((("oecd economies department nursing papers") OR ("oecd economies departments using papers"))))))) OR ("oecd economic department working paper")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"oecd economies department working paper\") or (((\"oecd economies department working papers\") or (((\"oecd economies department nursing papers\") OR (\"oecd economies departments using papers\"))))))) or (\"oecd economic department working paper\"))".
• Removing quotes may allow a broader search: (((( oecd economies department working paper ) or ((( oecd economies department working papers ) or ((( oecd economies department nursing papers ) OR ( oecd economies departments using papers ))))))) or ( oecd economic department working paper )).
• Adding a wildcard symbol may retrieve word variants: (((("oecd economies department working paper") or ((("oecd economies department working papers") or ((("oecd economies department nursing papers") OR ("oecd economies departments using papers"))))))) or ("oecd economic department working paper"))*.