Perhaps you should try some spelling variations:
"modified objective optimization algorithms" » "modified objective optimisation algorithm", "modified objective estimation algorithms", "modified objective estimation algorithm", "modified multiobjective optimization algorithms"
"modified stochastic optimized algorithm" » "modified stochastic optimization algorithm", "modified stochastic optimized algorithms", "modified stochastic optimizer algorithms"

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