Perhaps you should try some spelling variations:
"modified multiobjective estimation algorithmss" » "modified multiobjective optimization algorithmss", "modified multiobjective estimation algorithms", "modified multiobjective estimation algorithm", "modified multiobjective optimization algorithms"
"modified policy optimization algorithm" » "modified policy optimization algorithms", "modified policy optimisation algorithm", "modified policy estimation algorithm", "modified topology 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 multiobjective estimation algorithmss\"))~".
• Removing quotes may allow a broader search: (( modified policy optimization algorithm ) OR ( modified multiobjective estimation algorithmss ))~.
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