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

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