Perhaps you should try some spelling variations:
"modified df optimization algorithms" » "modified df optimisation algorithm", "modified df estimation algorithm", "modified df optimized algorithms", "modified _ optimization algorithms", "modified qoe optimization algorithms", "modified _ optimisation algorithms", "modified adam optimization algorithms", "modified bi1 optimization algorithms"
"modified notion estimation algorithms" » "modified notion estimation algorithm", "modified notion optimisation algorithm", "modified notion approximation algorithms", "modified motion estimation algorithms"

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