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

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