Why 7 eleven doesn't grow to other countries?

It doesn't grow because it doesn't need too. There's an old saying "pigs get fat and hogs get slaughtered". Why be greedy? We all have an idea of winning or success? And once reached, why should we get more. 7 eleven as an empire, doesn't need to progress. They fulfilled their mission and the owners are likely using it as passive income streams to invest their money in other profitable ventures.