Perhaps you should try some spelling variations:
"modified stochastic optimization algorithms" » "modified stochastic estimation algorithms", "modified stochastic estimation algorithm", "modified stochastic optimized algorithms"
"modified invasive optimisation algorithm" » "modified invasive estimation algorithm", "modified invasive estimation algorithms", "modified passive optimisation algorithm"

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