Perhaps you should try some spelling variations:
"modified bi1 optimization algorithms" » "modified bi1 optimisation algorithm", "modified bi1 estimation algorithms", "modified bi1 estimation algorithm", "modified bi1 optimisation algorithms", "modified bi1 estimation algorithmss", "modified _ optimization algorithms", "modified qoe optimization algorithms", "modified game 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 bi1 optimization algorithms") OR ("modified parameters optimization algorithm"))~.
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