That's cool. For us "kuey tiaw" is like the name of the noodle dish, then in "kuey tiaw" you can choose different kinds of noodles in it, for example, Big flat, thin, egg, vermicelli or glass noodle. So basically when we order we have to tell which noodle we want.
Also, sometimes we can have "dry kuey tiaw" which is a noodle dish without a soup, or in some cases a soup on the side. haha, I can go on and on about noodle dishes honestly. And I can't wait to try some Malaysian kuey tiaw soup when I'm there :)
Thanks for googling and exchanging this topic with me.