Perhaps you should try some spelling variations:
optimisation algorithm » optimization algorithms, estimation algorithm, estimation algorithms
quantization algorithm » estimation algorithm
passive quantization » adaptive quantization
network optimisation » network optimization
modified passive » modified adaptive
verified network » certified network, defined network

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• Performing a fuzzy search may retrieve terms with similar spellings: (( modified passive quantization algorithm ) or ( verified network optimisation algorithm ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( modified passive quantization algorithm ) OR ( verified network optimisation algorithm )).
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