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

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• Performing a fuzzy search may retrieve terms with similar spellings: (("modified stochastic estimation algorithms") OR ("modified notion optimized algorithms"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified stochastic estimation algorithms\") OR (\"modified notion optimized algorithms\"))*".
• Removing quotes may allow a broader search: (( modified stochastic estimation algorithms ) OR ( modified notion optimized algorithms ))*.