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

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