Perhaps you should try some spelling variations:
"modified bi1 optimisation algorithm" » "modified bi1 optimization algorithms", "modified bi1 estimation algorithm", "modified _ optimisation algorithm", "modified _ optimization algorithm", "modified qoe optimization algorithm"
"modified allocation estimation algorithms" » "modified allocation optimization algorithms", "modified motion estimation algorithms", "modified allocation estimation algorithm", "modified allocation approximation algorithms"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified bi1 optimisation algorithm") OR ("modified allocation estimation algorithms"))~.
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