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

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