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

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