Perhaps you should try some spelling variations:
"modified df estimation algorithmss" » "modified df estimation algorithms", "modified df estimation algorithm", "modified df optimization algorithms", "modified _ estimation algorithmss", "modified adam estimation algorithmss", "modified bi1 estimation algorithmss"
"modified objective allocation algorithms" » "modified objective estimation algorithms", "modified objective approximation algorithms"

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