Perhaps you should try some spelling variations:
optimization algorithms » optimisation algorithm, estimation algorithms, estimation algorithm
quantization algorithm » estimation algorithm
adaptive quantization » adaptive ventilation
modified adaptive » modified passive
df optimization » _ optimization, qoe optimization, _ optimisation
modified df » modified _, modified adam, modified bi1

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• Performing a fuzzy search may retrieve terms with similar spellings: (( modified df optimization algorithms ) OR ( modified adaptive quantization algorithm ))~.
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