Perhaps you should try some spelling variations:
"modified passive optimization algorithms" » "modified passive estimation algorithms", "modified passive estimation algorithm", "modified passive optimized algorithms", "modified bayesian optimization algorithms", "modified game optimization algorithms", "modified policy optimization algorithms", "modified adaptive optimization algorithms"
"modified df optimisation algorithm" » "modified df estimation algorithm", "modified df estimation algorithms", "modified _ optimisation algorithm", "modified _ optimization algorithm", "modified qoe optimization algorithm", "modified adam optimisation algorithm", "modified bi1 optimisation algorithm"

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