"Tien Gow" is sometimes spelled Tin Kau, and is the transliteration of two Chinese characters (天九) in Cantonese: [Heaven] and [Nine]. In Mandarin, it is pronounced as Tian1Jiu3.
A search for "Tien Gow" or "Tin Kau" on [google.com] reveals most references for Tien Gow on the web.
See also: Pai Gow, Gwat Pai, Che Deng
External links: [Tien Gow]