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 predators algorithm" » "modified ohca predation algorithm", "modified orca predators algorithm"

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