Perhaps you should try some spelling variations:
"modified passive quantization algorithm" » "modified passive estimation algorithm", "modified adaptive quantization algorithm"
"modified df approximation algorithms" » "modified _ approximation algorithms", "modified one approximation algorithms", "modified time approximation algorithms", "modified adam approximation algorithms", "modified bi1 approximation algorithms"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified df approximation algorithms\") OR (\"modified passive quantization algorithm\"))~".
• Removing quotes may allow a broader search: (( modified df approximation algorithms ) OR ( modified passive quantization algorithm ))~.
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