Zhongguo, meaning central land or central kingdom is pronounced, according to a Professor of Zhongyuan dialect of Mandarin, reasonably close to Tszung gwaa.. you can hear it here, if you'd like: http://www.clearchinese.com/audio/sentences/zh gchyrl.wav
The entire phrase is: Zhōnggu� ch�ngch�ng yǒu r�n l�i Měigu� t�n shēngyi... meaning "There are visitors often coming from China to do business" Listen for the first word...