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

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• Performing a fuzzy search may retrieve terms with similar spellings: (("modified passive optimization algorithms") OR ("modified _ optimisation algorithm"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified passive optimization algorithms\") OR (\"modified _ optimisation algorithm\"))*".
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