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

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