12. The computer program product of claim 11 , where predicting the trigger query using a portion of the first search query includes determining that the predicted trigger query has a confidence score associated with the prediction that exceeds a threshold.
11. The computer program product of claim 9 , where determining, based on the probability model of previous behavior of a collection of users, that the first search query is a trigger query includes predicting the trigger query using a portion of the first search query.