There is "Studies on Chinese Salamanders", Ermi Zhao, Yaoming Jiang, Qixiong Hu, Yuhua Yang.
Not as nice and detailed as Petranka's or Griffith's book, but it is the only English language book about Asian, esp. Chinese species that I know of and is pretty good. It was published in cooperation with the Herpetological Society of Japan and the Japan Wildlife Research Center.