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

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