Perhaps you should try some spelling variations:
"modified passive optimization algorithms" » "modified passive optimisation algorithm", "modified passive estimation algorithms", "modified passive estimation algorithm", "modified bayesian optimization algorithms", "modified game optimization algorithms", "modified policy optimization algorithms"
"modified adaptive quantization algorithm" » "modified adaptive estimation algorithm", "modified adaptive ventilation algorithm"

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