Speaking English is a passport for whoever wants to work in a restaurant, hotel, or in the tourist industry in general, even just for a normal job that doesn't necessarily need English. That's why there are so many people studying English now.
As I said in my other post about my work place, working in hospitality is not as easy as it looks, especially in Viet Nam, because it not only needs skill but it needs you to speak at least English because most customers who come to my restaurant are foreigners. I feel annoyed sometimes with my clients when they ask my colleagues, "Can I speak with someone can speak English to take my orders?" I have to explain so many times about this situation, that they just have to be patient but some of them get really angry.