Perhaps you should try some spelling variations:
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"oecd academic department working papers" » "oecd academic departments working papers", "oecd academic patent working papers", "oecd academic development working papers", "oecd academic department nursing papers", "oecd academic department work papers", "oecd academic department working paper", "second academic department working papers", "world academic department working papers", "board academic department working papers"
"lead academic department working papers" » "lead academic departments working papers", "lead academic patent working papers", "lead academic development working papers", "lead academic department nursing papers", "lead academic department work papers", "lead academic department working paper", "learn academic department working papers", "leave academic department working papers", "bad academic department working papers"
"oecd economic department boarding papers" » "oecd economic debasement boarding papers", "oecd economic experiment boarding papers", "oecd economic treatment boarding papers", "oecd economic department building papers", "oecd economic department cardiac papers", "oecd economic department imaging papers", "oecd economic department boarding pass", "oecd economic department boarding passes", "oecd economic department learning papers"

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 department working papers") OR ((("oecd academic department working papers") OR ("lead academic department working papers"))))) OR ("oecd economic department boarding papers")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"oecd economics department working papers\") or (((\"oecd academic department working papers\") OR (\"lead academic department working papers\"))))) or (\"oecd economic department boarding papers\"))".
• Removing quotes may allow a broader search: (((( oecd economics department working papers ) or ((( oecd academic department working papers ) OR ( lead academic department working papers ))))) or ( oecd economic department boarding papers )).
• Adding a wildcard symbol may retrieve word variants: (((("oecd economics department working papers") or ((("oecd academic department working papers") OR ("lead academic department working papers"))))) or ("oecd economic department boarding papers"))*.