Perhaps you should try some spelling variations:
"modified notion optimisation algorithms" » "modified notion optimisation algorithm", "modified notion optimization algorithms", "modified notion estimation algorithm", "modified network optimization algorithms"
"modified parameter estimation algorithms" » "modified parameter estimation algorithm", "modified parameter optimization algorithms", "modified parameter optimisation algorithm", "modified parameter estimates algorithms"

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