Perhaps you should try some spelling variations:
"oecd economic debasement working papers" » "oecd economic measurement working papers", "oecd economic appeasement working papers", "oecd economic management working papers", "oecd economic deployment working papers", "oecd economic element working papers"
"oecd economic department working paper" » "oecd economics department working paper", "oecd academic department working paper", "oecd economic experiment working paper", "oecd economic departments working paper", "oecd economic department boarding paper", "oecd economic department nursing paper"
"oecd economic statement working papers" » "oecd economy statement working papers", "oecd economic sentiment working papers", "oecd economic placement working papers", "oecd economic statements working papers", "oecd economic statement looping papers", "oecd economic statement making papers"
"oecd economic descent working papers" » "oecd economic desert working papers", "oecd economic discount working papers", "oecd economic design working papers", "oecd economic adjacent working papers", "oecd economic descent parsing papers", "oecd economic event working papers"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (((((("oecd economic debasement working papers") OR ("oecd economic descent working papers"))) OR ("oecd economic statement working papers"))) OR ("oecd economic department working paper")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"oecd economic debasement working papers\") OR (\"oecd economic descent working papers\"))) or (\"oecd economic statement working papers\"))) or (\"oecd economic department working paper\"))".
• Removing quotes may allow a broader search: (((((( oecd economic debasement working papers ) OR ( oecd economic descent working papers ))) or ( oecd economic statement working papers ))) or ( oecd economic department working paper )).
• Adding a wildcard symbol may retrieve word variants: (((((("oecd economic debasement working papers") OR ("oecd economic descent working papers"))) or ("oecd economic statement working papers"))) or ("oecd economic department working paper"))*.