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

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