Perhaps you should try some spelling variations:
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"oecd academic department nursing papers" » "oecd academic departments nursing papers", "oecd academic development nursing papers", "oecd academic department guessing papers", "oecd academic departments using papers", "oecd academic department building papers", "oecd academic department using papers", "oecd academic department nursing fathers", "oecd academic department nursing experts", "lead academic department nursing papers", "second academic department nursing papers", "world academic department nursing papers"
"oecd academic patent working papers" » "oecd academic content working papers", "oecd academic papers working papers", "oecd academic paper working papers", "oecd academic patent working paper", "oecd academic patients working papers", "oecd academic paint working papers", "oecd academic intent working papers", "lead academic patent working papers", "second academic patent working papers", "world academic patent working papers"

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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 patent 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 department working papers") OR ("oecd academic patent working papers"))) or ("oecd academic department nursing papers"))) or ("oecd economic department boarding papers"))*.