Perhaps you should try some spelling variations:
"modified adaptive optimization algorithms" » "modified adaptive optimisation algorithm", "modified adaptive estimation algorithms", "modified adaptive estimation algorithm", "modified objective optimization algorithms", "modified adaptive quantization algorithms", "modified static optimization algorithms"
"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 (\"modified adaptive optimization algorithms\"))~".
• Removing quotes may allow a broader search: (( modified passive quantization algorithm ) OR ( modified adaptive optimization algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified passive quantization algorithm") OR ("modified adaptive optimization algorithms"))*.