When you go to rice restaurant, all the food will be displayed in the front so take a look at the pictures and than you can just point to what you want. You can get as many toppings as you like.
The thing that you need to know is you can order in 2 different styles.
Dia (yee-a) – Is personal you are ordering individual plates for everybody.
Phan (fan) – Family Style, you say how many people they give you the appropriate amount of rice, you can order more if you want, and you pick your toppings to share
Vietnamese Street Food 