Nobody has them because he only shares them with his friends, and by that I mean ACTUAL friends. Only like five people have them and they're not going to share them.
There are multiple different romanization systems. 'Cha' is hepburn, a system made by us westerners to reoresent how the word would be vocalized. 'tya' is a typical way you'd romanize that in nihon-shiki or kunrei-shiki, which are Japanese romanization systems. The point of nihon-shiki is not...