Perhaps you should try some spelling variations:
"modified multiobjective allocation algorithm" » "modified objective allocation algorithm", "modified multiobjective estimation algorithm", "modified multiobjective evolution algorithm", "modified multiobjective solution algorithm"
"modified objective predation algorithm" » "modified objective allocation algorithm", "modified objective predators algorithm", "modified objective estimation algorithm"

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