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 multiobjective optimization algorithm" » "modified multiobjective optimization algorithms", "modified multiobjective optimisation algorithm", "modified multiobjective estimation algorithm"

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