Perhaps you should try some spelling variations:
"modified stochastic optimization algorithms" » "modified stochastic optimisation algorithm", "modified stochastic estimation algorithm", "modified stochastic optimized algorithms"
"modified parameter estimation algorithms" » "modified parameter estimation algorithm", "modified parameter optimisation algorithm", "modified parameter approximation algorithms", "modified parameter estimates algorithms", "modified parameter optimization algorithms"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified stochastic optimization algorithms\") OR (\"modified parameter estimation algorithms\"))~".
• Removing quotes may allow a broader search: (( modified stochastic optimization algorithms ) OR ( modified parameter estimation algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified stochastic optimization algorithms") OR ("modified parameter estimation algorithms"))*.