15. One or more non-transitory computer-readable storage media encoded with instructions that, when executed by one or more computers, cause the one or more computers to perform operations comprising: receiving a first voice query; generating a first recognition output; receiving a second voice query; determining from a recognition of the second voice query that the second voice query triggers a correction request; using the first recognition output and the second recognition to determine a plurality of candidate corrections including: determining a misrecognition portion of the first recognition output, and substituting the misrecognition portion with one or more candidate n-grams to form a candidate correction; scoring each candidate correction; and generating a corrected recognition output for a particular candidate correction having a score that satisfies a threshold value.
15. One or more non-transitory computer-readable storage media encoded with instructions that, when executed by one or more computers, cause the one or more computers to perform operations comprising: receiving a first voice query; generating a first recognition output; receiving a second voice query; determining from a recognition of the second voice query that the second voice query triggers a correction request; using the first recognition output and the second recognition to determine a plurality of candidate corrections including: determining a misrecognition portion of the first recognition output, and substituting the misrecognition portion with one or more candidate n-grams to form a candidate correction; scoring each candidate correction; and generating a corrected recognition output for a particular candidate correction having a score that satisfies a threshold value. 18. The one or more non-transitory computer-readable storage media of claim 15 , wherein the one or more candidate n-grams are obtained from one or more of: recognition of a correction portion of the second voice query; generated hypotheses of the correction portion of the second voice query; a misrecognition index of phonetically similar n-grams; or n-grams associated with a type or category associated with the correction portion of the second voice query.