Perhaps you should try some spelling variations:
"modified dfdamdamdaptive quantization algorithm" » "modified adaptive quantization algorithm", "modified dfdamdamdaptive estimation algorithm"
"modified _ optimization algorithm" » "modified _ optimization algorithms", "modified _ optimisation algorithm", "modified _ estimation algorithm"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified _ optimization algorithm") OR ("modified dfdamdamdaptive quantization algorithm"))~.
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