Perhaps you should try some spelling variations:
"verified network approximation algorithm" » "verified network approximation algorithms", "certified network approximation algorithm", "defined network approximation algorithm"
"modified passive quantization algorithm" » "modified passive estimation algorithm", "modified adaptive quantization algorithm"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified passive quantization algorithm\") OR (\"verified network approximation algorithm\"))~".
• Removing quotes may allow a broader search: (( modified passive quantization algorithm ) OR ( verified network approximation algorithm ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified passive quantization algorithm") OR ("verified network approximation algorithm"))*.