Perhaps you should try some spelling variations:
"modified objective optimization algorithmss" » "modified objective optimization algorithms", "modified objective optimisation algorithm", "modified objective estimation algorithms", "modified multiobjective optimization algorithmss"
"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 objective optimization algorithmss"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified objective predation algorithm\") OR (\"modified objective optimization algorithmss\"))*".
• Removing quotes may allow a broader search: (( modified objective predation algorithm ) OR ( modified objective optimization algorithmss ))*.