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

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