8. A system comprising: a processor; and a computer-readable storage medium having instructions stored which, when executed by the processor, cause the processor to perform operations comprising: receiving data corresponding to a text query from a user; retrieving a spoken document associated with the text query; searching a word index of the spoken document associated with the text query using the text query, to yield first search results; searching a sub-word index of the spoken document associated with the text query using the text query, to yield second search results; and returning, via a computer network and according to the first search results and the second search results, audio segments from the spoken document associated with the text query which correspond to the text query.
8. A system comprising: a processor; and a computer-readable storage medium having instructions stored which, when executed by the processor, cause the processor to perform operations comprising: receiving data corresponding to a text query from a user; retrieving a spoken document associated with the text query; searching a word index of the spoken document associated with the text query using the text query, to yield first search results; searching a sub-word index of the spoken document associated with the text query using the text query, to yield second search results; and returning, via a computer network and according to the first search results and the second search results, audio segments from the spoken document associated with the text query which correspond to the text query. 14. The system of claim 8 , wherein the text query from the user is converted to text via automatic speech recognition.