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

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified df optimization algorithms") OR ("modified parameters optimization algorithm"))~.
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