Perhaps you should try some spelling variations:
"modified bayesian optimization algorithm" » "modified bayesian optimization algorithms", "modified bayesian optimisation algorithm", "modified bayesian estimation algorithm"
"modified churn prediction algorithm" » "modified churn predation algorithm", "modified churn predators algorithm", "modified cliff prediction algorithm", "modified fire prediction algorithm"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified bayesian optimization algorithm") OR ("modified churn prediction algorithm"))~.
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