Yes,they have.However,if you definitely like vegeterian or even vegan food, you can come to Bo de quan in Quan Su street, next to Quan Su pagoda. Food there is really good.
The servers speak good English so I'm sure they could adapt if not
be careful, even veggies dish might use fish sauce or other. Go to real vegan restaurant
They have some vegetable dishes.
Get quick answers from Quan An Ngon staff and past visitors.