Perhaps you should try some spelling variations:
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"oecd academic patent working papers" » "oecd academic content working papers", "oecd academic papers working papers", "oecd academic paper working papers", "oecd academic patients working papers", "oecd academic paint working papers", "oecd academic intent working papers", "oecd academic patent working paper", "second academic patent working papers", "world academic patent working papers", "board academic patent working papers"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (((((("oecd academic patent working papers") OR ("lead academic department working papers"))) OR ("oecd academic department nursing papers"))) OR ("oecd economic department boarding papers")).
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• Adding a wildcard symbol may retrieve word variants: (((((("oecd academic patent working papers") or ("lead academic department working papers"))) or ("oecd academic department nursing papers"))) or ("oecd economic department boarding papers"))*.