Perhaps you should try some spelling variations:
"modified passive quantization algorithmss" » "modified passive estimation algorithms", "modified passive optimization algorithms", "modified adaptive quantization algorithmss"
"modified objective approximation algorithm" » "modified objective approximation algorithms"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified passive quantization algorithmss") OR ("modified objective approximation algorithm"))~.
• Removing quotes may allow a broader search: (( modified passive quantization algorithmss ) or ( modified objective approximation algorithm ))~.
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