Perhaps you should try some spelling variations:
"modified dfdamdaptive quantization algorithm" » "modified adaptive quantization algorithm", "modified dfdamdaptive estimation algorithm"
"modified a approximation algorithms" » "modified _ approximation algorithms", "modified one approximation algorithms", "modified time approximation algorithms", "modified df approximation algorithms", "modified adam approximation algorithms"

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