Perhaps you should try some spelling variations:
"modified stochastic optimization algorithms" » "modified stochastic optimisation algorithm", "modified stochastic estimation algorithms", "modified stochastic estimation algorithm"
"modified objective evolutionary algorithm" » "modified objective evolution algorithm", "modified objective solution algorithm"

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