I was thinking that might be the case. I must ask someone who understands the language to check the Vietnamese store. Thanks. If I come across anything I'll post it. I have a feeling clever_bug might know something quicker though, he is quite an excellent information source.
I don't know. The game was scheduled to be released on Jun 30 on iOS, but it did not come in deed. However, you can try the Android version of the game on Google Play (if you have an Android phone): https://play.google.com/store/apps/details?id=com.codostudio.Capital1975. I guess the game is coming to iOS this July.