Perhaps you should try some spelling variations:
"oecd economics department working papers" » "oecd economics development working papers", "oecd economics experiments working papers", "oecd economics management working papers", "oecd economics departments working papers", "oecd economics department boarding papers", "oecd economics department nursing papers", "oecd economies department working papers", "kcd economics department working papers", "world economics department working papers"
"oecd economic experiment working papers" » "oecd economic experiments working papers", "oecd economics experiments working papers", "oecd economic empowerment working papers", "oecd economic experimental working papers", "oecd economic experiment wirkung papers", "world economic experiment working papers"
"oecd academic department working papers" » "oecd academic departments working papers", "oecd academic patent working papers", "oecd academic development working papers", "oecd academic department boarding papers", "oecd academic department nursing papers", "lead academic department working papers", "second academic department working papers", "board academic department working papers"
"oecd academic department working paper" » "oecd academic departments working paper", "oecd academic patent working paper", "oecd academic development working paper", "oecd academic department boarding paper", "oecd academic department nursing paper", "lead academic department working paper", "second academic department working paper", "board academic department working paper"
"world academic department working paper" » "world academic departments working paper", "world academic patent working paper", "world academic development working paper", "world academic department boarding paper", "world academic department nursing paper"

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