Perhaps you should try some spelling variations:
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"oecd economic department working papers" » "oecd economics department working papers", "oecd economic debasement working papers", "oecd academic department working papers", "oecd economic department nursing papers", "oecd economic department work papers", "oecd economic department solving papers"
"oecd economic department working paper" » "oecd economics department working paper", "oecd economic debasement working paper", "oecd academic department working paper", "oecd economic department nursing paper", "oecd economic department work paper", "oecd economic department solving paper"

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