Perhaps you should try some spelling variations:
"modified df optimization algorithm" » "modified df optimization algorithms", "modified df optimisation algorithm", "modified df estimation algorithm", "modified _ optimization algorithm", "modified qoe optimization algorithm", "modified _ optimisation algorithm", "modified adam optimization algorithm", "modified bi1 optimization algorithm"
"modified attributes estimation algorithms" » "modified attribute optimization algorithms", "modified attributes estimation algorithm", "modified attributes optimization algorithms", "modified attributes optimisation algorithm"

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