Perhaps you should try some spelling variations:
"modified _ optimization algorithms" » "modified _ optimisation algorithm", "modified _ estimation algorithms", "modified _ estimation algorithm", "modified _ optimisation algorithms", "modified _ estimation algorithmss"
"modified bayesian optimization algorithm" » "modified bayesian optimisation algorithm", "modified bayesian estimation algorithm", "modified bayesian estimation algorithms"

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