Perhaps you should try some spelling variations:
"modified static optimization algorithm" » "modified static optimization algorithms", "modified static estimation algorithm", "modified static estimation algorithms", "modified stage optimization algorithm", "modified stochastic optimization algorithm", "modified staffing optimization algorithm"
"modified parameter optimisation algorithm" » "modified parameter optimization algorithm", "modified parameter estimation algorithm", "modified parameter optimization algorithms", "modified parameter estimation algorithms"

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