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

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified allocation estimation algorithms\") OR (\"modified stochastic estimation algorithmss\"))~".
• Removing quotes may allow a broader search: (( modified allocation estimation algorithms ) OR ( modified stochastic estimation algorithmss ))~.
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