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

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified stochastic estimation algorithm") OR ("modified stochastic estimation algorithmss"))~.
• Removing quotes may allow a broader search: (( modified stochastic estimation algorithm ) or ( modified stochastic estimation algorithmss ))~.
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