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

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