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

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