Perhaps you should try some spelling variations:
"sideslip quantile estimation" » "sideslip quality estimation", "sideslip quantitative estimation", "sideslip angle estimation"
"sideslip charge estimation" » "sideslip channel estimation", "sideslip age estimation", "sideslip curve estimation"

Try widening your search to All Fields.

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("sideslip quantile estimation") OR ("sideslip charge estimation")).
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