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

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