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

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