Perhaps you should try some spelling variations:
"modified orcad optimization algorithms" » "modified orcad optimisation algorithm", "modified orcad estimation algorithms", "modified orcad estimation algorithm", "modified orcad optimisation algorithms", "modified orcad estimation algorithmss", "modified orca optimization algorithms"
"modified multiobjective optimization algorithm" » "modified multiobjective optimisation algorithm", "modified multiobjective estimation algorithm", "modified multiobjective estimation algorithms"

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