Perhaps you should try some spelling variations:
"online turing research documents" » "online turing search document", "online turing research arguments", "online turing research comments", "online turning research documents", "online curing research documents", "online during research documents", "online tuning research documents"
"nonlinear range research contents" » "nonlinear range research content", "nonlinear range research context", "nonlinear range research concepts", "nonlinear granger research contents", "nonlinear rate research contents", "nonlinear ring research contents", "nonlinear change research contents", "nonlinear large research contents", "nonlinear range search contents"

Try widening your search to All Fields.

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("online turing research documents") OR ("nonlinear range research contents")).
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