Perhaps you should try some spelling variations:
"modified dfdaptive quantization algorithm" » "modified dfdaptive estimation algorithm", "modified adaptive quantization algorithm"
"modified adam estimation algorithms" » "modified adam estimation algorithm", "modified adam optimization algorithms", "modified adam optimisation algorithm", "modified df estimation algorithms", "modified near estimation algorithms"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified adam estimation algorithms") OR ("modified dfdaptive quantization algorithm")).
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