10. The non-transitory computer-readable storage medium of claim 9 , wherein documents relates to a first document based at least on a frame of time.
9. A non-transitory computer-readable storage medium storing instructions which, when executed by a computing device, cause the computing device to evaluate effectiveness of speech retrieval of documents, the instructions comprising: removing terms in vectors that are not recognized by a recognizer, the vectors being associated with automatic transcriptions of documents; generating weighted vectors by modifying weights of terms in the vectors; adding to the weighted vectors terms which were not recognized by the recognizer; receiving a plurality of speech queries for the documents, wherein the speech queries are based on the weighted vectors; and determining effectiveness of the received plurality of speech queries based on queries in the plurality of speech queries which result in a number of relevant documents equal to or greater than a predetermined threshold.