Perhaps you should try some spelling variations:
"modified bi1 estimation algorithms" » "modified bi1 estimation algorithm", "modified bi1 optimization algorithms", "modified bi1 optimisation algorithm", "modified risk estimation algorithms", "modified _ estimation algorithms"
"modified parameters estimation algorithms" » "modified parameters estimation algorithm", "modified parameters optimization algorithms", "modified parameters optimisation algorithm", "modified parameter estimation algorithms", "modified parameter estimates algorithms", "modified parameter optimization algorithms"

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