Perhaps you should try some spelling variations:
"modified bi1 optimization algorithmssss" » "modified bi1 optimization algorithms", "modified bi1 optimisation algorithm", "modified _ optimization algorithmssss", "modified qoe optimization algorithmssss", "modified game optimization algorithmssss", "modified bi1 optimization algorithmsss"
"modified objective approximation algorithms" » "modified objective approximation algorithm"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified bi1 optimization algorithmssss") OR ("modified objective approximation algorithms"))~.
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