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

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