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

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• Performing a fuzzy search may retrieve terms with similar spellings: (("modified ohca predation algorithm") or ("modified multiobjective optimization algorithms"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified ohca predation algorithm") OR ("modified multiobjective optimization algorithms"))*.
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