Perhaps you should try some spelling variations:
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"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 nursing paper", "oecd economic department work paper"
"oecd economic department boarding papers" » "oecd economics department boarding papers", "oecd academic department 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"
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• If you are trying to use Boolean operators, they must be ALL CAPS: (((("oecd economic department working papers") OR ("oecd economic department working paper"))) OR ((("oecd economic department boarding papers") OR ("oecd economic debasement boarding papers")))).
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• Adding a wildcard symbol may retrieve word variants: (((("oecd economic department working papers") OR ("oecd economic department working paper"))) or ((("oecd economic department boarding papers") or ("oecd economic debasement boarding papers"))))*.