Perhaps you should try some spelling variations:
"modified stochastic optimization algorithms" » "modified stochastic optimisation algorithm", "modified stochastic estimation algorithms", "modified stochastic estimation algorithm", "modified stochastic optimisation algorithms", "modified stochastic estimation algorithmss"
"modified network optimization algorithm" » "modified network optimisation algorithm", "modified network estimation algorithm", "modified network estimation algorithms", "certified network optimization algorithm", "defined network optimization algorithm", "modified near optimization algorithm"

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