Perhaps you should try some spelling variations:
22probability theory » probabillity theory, hyperstability theory, probabilistic theory
e.probability theory » probabillity theory, hyperstability theory, probabilistic theory
probability theorem » probability theorems, probability theories, stability theorem
2probability theory » probabillity theory, probabilistic theory, probability theories

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• If you are trying to use Boolean operators, they must be ALL CAPS: %((((((22probability theory) OR (probability theorem))) OR (e.probability theory))) OR (2probability theory)) AND stochastic processes%22.
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