Perhaps you should try some spelling variations:
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• If you are trying to use Boolean operators, they must be ALL CAPS: (((("oecd academic paper coating pass") OR ("oecd academic paper coating fast"))) OR ("oecd economic debasement working papers")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"oecd academic paper coating pass\") OR (\"oecd academic paper coating fast\"))) or (\"oecd economic debasement working papers\"))".
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• Adding a wildcard symbol may retrieve word variants: (((("oecd academic paper coating pass") OR ("oecd academic paper coating fast"))) or ("oecd economic debasement working papers"))*.