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

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