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

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• Performing a fuzzy search may retrieve terms with similar spellings: (("modified objective estimation algorithm") OR ("modified stochastic optimization algorithm"))~.
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• Removing quotes may allow a broader search: (( modified objective estimation algorithm ) OR ( modified stochastic optimization algorithm ))*.