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

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified parameter estimation algorithms\") OR (\"modified parameters estimation algorithmss\"))~".
• Removing quotes may allow a broader search: (( modified parameter estimation algorithms ) OR ( modified parameters estimation algorithmss ))~.
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