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

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