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 objective optimisation algorithms" » "modified objective optimisation algorithm", "modified objective estimation algorithms", "modified objective estimation algorithm", "modified objective optimization algorithms", "modified multiobjective 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 objective optimisation algorithms\"))~".
• Removing quotes may allow a broader search: (( modified parameter optimization algorithms ) OR ( modified objective optimisation algorithms ))~.
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