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 optimizer algorithms" » "modified orca optimized algorithms", "modified orca optimized algorithm", "modified orca optimization algorithms", "modified dorca optimizer algorithms", "modified orcad optimizer algorithms", "modified ohca optimizer algorithms"

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