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

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified policy estimation algorithms") OR ("modified multiobjective optimized algorithms")).
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