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

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