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

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