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

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