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

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