Perhaps you should try some spelling variations:
"modified adaptive quantization algorithms" » "modified adaptive estimation algorithms", "modified adaptive optimization algorithms", "modified adaptive ventilation algorithms", "modified passive quantization algorithms"
"modified positive solution algorithm" » "modified positive evolution algorithm", "modified positive convolution algorithms", "modified positive evolutionary algorithm", "modified passive solution algorithm", "modified positive solutions algorithm"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified adaptive quantization algorithms") OR ("modified positive solution algorithm"))~.
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