Perhaps you should try some spelling variations:
"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", "lead academic department working papers", "second academic department working papers", "world 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 nursing paper", "oecd academic department work paper", "lead academic department working paper", "second academic department working paper", "world academic department working paper"
"oecd economic department boarding papers" » "oecd economics department boarding papers", "oecd economic debasement boarding papers", "oecd economic experiment boarding papers", "oecd economic department building papers", "oecd economic department boards papers", "oecd economic department providing papers", "oecd economic department boarding pass", "oecd economic department boarding passes", "oecd economic department learning papers"
"oecd economic department marking papers" » "oecd economics department marking papers", "oecd economic debasement marking papers", "oecd economic experiment marking papers", "oecd economic department marketing papers", "oecd economic department mapping papers", "oecd economic department managing papers", "oecd economic department making paper", "oecd economic department morning papers", "oecd economic department ranking 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 academic department working papers") OR ("oecd academic department working paper"))) OR ((("oecd economic department boarding papers") OR ("oecd economic department marking papers")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"oecd academic department working papers\") OR (\"oecd academic department working paper\"))) or (((\"oecd economic department boarding papers\") or (\"oecd economic department marking papers\"))))".
• Removing quotes may allow a broader search: (((( oecd academic department working papers ) OR ( oecd academic department working paper ))) or ((( oecd economic department boarding papers ) or ( oecd economic department marking papers )))).
• Adding a wildcard symbol may retrieve word variants: (((("oecd academic department working papers") OR ("oecd academic department working paper"))) or ((("oecd economic department boarding papers") or ("oecd economic department marking papers"))))*.