Perhaps you should try some spelling variations:
"oecd economies departments working papers" » "oecd economics department working papers", "oecd economies developments working papers", "oecd colleges departments working papers", "oecd economies department working papers", "oecd economies departments wrong papers", "oecd economies department nursing papers", "oecd economies departments working paper"
"oecd economics departments working papers" » "oecd economics department working papers", "oecd economics experiments working papers", "oecd economics payments working papers", "oecd economics departments wrong papers", "oecd economics department nursing papers", "kcd economics departments working papers", "world economics departments working papers", "land economics departments working papers", "oecd economics departments working paper"
"sound economics departments working papers" » "sound economics department working papers", "sound economics experiments working papers", "sound economics payments working papers", "sound economics departments wrong papers", "sound economics department nursing papers", "sound economic departments working papers", "land economics departments working papers", "cloud economics departments working papers", "sound economics departments working paper"
"oecd economic departments working papers" » "oecd economics department working papers", "oecd economic experiments working papers", "oecd academic departments working papers", "oecd economic department working papers", "oecd economic departments wrong papers", "oecd economic department nursing papers", "oecd economic departments 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 economics departments working papers") OR ("sound economics departments working papers"))) OR ("oecd economies departments working papers"))) OR ("oecd economic departments working papers")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"oecd economics departments working papers\") OR (\"sound economics departments working papers\"))) or (\"oecd economies departments working papers\"))) or (\"oecd economic departments working papers\"))".
• Removing quotes may allow a broader search: (((((( oecd economics departments working papers ) OR ( sound economics departments working papers ))) or ( oecd economies departments working papers ))) or ( oecd economic departments working papers )).
• Adding a wildcard symbol may retrieve word variants: (((((("oecd economics departments working papers") OR ("sound economics departments working papers"))) or ("oecd economies departments working papers"))) or ("oecd economic departments working papers"))*.