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

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