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

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• If you are trying to use Boolean operators, they must be ALL CAPS: %((2((((2probability theory) OR (probabillity theory))) OR (probability theorem))) OR (((((2probability theory) OR (probabillity theory))) OR (probability theorem)))) AND stochastic processes%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((2((((2probability theory) OR (probabillity theory))) or (probability theorem))) or (((((2probability theory) OR (probabillity theory))) or (probability theorem)))) and stochastic processes%22".
• Adding a wildcard symbol may retrieve word variants: %((2((((2probability theory) OR (probabillity theory))) or (probability theorem))) or (((((2probability theory) OR (probabillity theory))) or (probability theorem)))) and stochastic processes%22*.