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

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• If you are trying to use Boolean operators, they must be ALL CAPS: (( modified _damdaptive quantization algorithm ) OR ( modified df optimisation algorithm ))~.
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