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

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified multiobjective optimization algorithms") OR ("modified dorca predation algorithm"))~.
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