增加cmu sphinx中的语言模型大小

Hi i am working on cmu sphinx in windows xp . i have created language model as suggested by sphinx and when i tried to give a voice sample corresponding to the language model its working fine. but when i have more text in the language model and input the corresponding voice sample as input cmu is not able to detect words and it keeps using the words from top 100 lines of the reference text from which language model is created can anyone help me how to overcome this problem.Hi i am working on cmu sphinx in windows xp . i