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

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