Perhaps you should try some spelling variations:
"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 sentiment working paper" » "oecd economic environment working paper", "oecd economic statement working paper", "oecd economic sentiment scoring paper", "oecd economic retirement working paper"
"oecd economic apartment building papers" » "oecd economics department building papers", "oecd economic ajustment building papers", "oecd economic appeasement building papers", "oecd economic management building papers", "oecd economic apartment building paper", "oecd economic apartment building parsers", "oecd economic apartment building pages"

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (((("oecd economic departments working papers") OR ("oecd economic sentiment working paper"))) OR ("oecd economic apartment building papers")).
• Removing quotes may allow a broader search: (((( oecd economic departments working papers ) or ( oecd economic sentiment working paper ))) or ( oecd economic apartment building papers )).
• Adding a wildcard symbol may retrieve word variants: (((("oecd economic departments working papers") or ("oecd economic sentiment working paper"))) or ("oecd economic apartment building papers"))*.