Perhaps you should try some spelling variations:
"modified parameter optimization algorithms" » "modified parameter optimisation algorithm", "modified parameter estimation algorithms", "modified parameter estimation algorithm", "modified parameters optimization algorithms"
"modified response optimisation algorithms" » "modified response optimisation algorithm", "modified response estimation algorithms", "modified response estimation algorithm", "modified response optimization algorithms"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified parameter optimization algorithms\") OR (\"modified response optimisation algorithms\"))~".
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