23. The method of claim 21 , wherein the second language model is a general language model.
21. The method of claim 1 , wherein generating the second of the at least two search queries further comprises: performing speech recognition on the voice input using the second language model to generate a first recognition result for the voice input; determining a topic of the voice input by analyzing the first recognition result; determining that a topic-specific language model is appropriate for the topic; performing speech recognition on the voice input using the topic-specific language model to generate a second recognition result for the voice input; and wherein generating the second of the at least two search queries further comprises using the second recognition result to form the second of the at least two search queries.