I think foreigners may know about Phở bò already, so I think I should mention something unexpected: Phở bò's noodles (aka Sợi mỳ). We use noodles as a term to call almost anything made with rice (gạo tẻ) or sticky rice (gạo nếp). In Vietnam, sticky rice is used to make Bánh Chưng (chung cake, made with the idea that the earth is square), Bánh Giày (Round Sticky rice cake, made with the sky is round as the idea), Bánh Tét (Banh Tet, the Southern Vietnam equivalent to Bánh Chưng) Bánh Trung thu (moon cakes), xôi (sticky rice) in general, some other regions use sticky rice to make their unique delicacy, but all of them should be tasty
In my childhood, at night I could hear some travelling vendors at night shout: Ai bánh cuốn đây! Bánh ngô, bánh khoai, bánh giò, bánh bột lọc, bánh mỳ nóng nào! (Anyone want some Banh Cuon? Corn Cake, sweet potato cake, cake with meat filling, cake with filtered powder, Banh my here!). Banh my excluded, among the other cakes over, Bánh ngô is actually made with powder and cooked by frying (lol); the leftovers actually use rice as 1 of the main ingredient, with bean paste and the leaves to bound them of choice, then boil for a few hours and ready for sale.
The Sợi mỳ (noodles) of the manga is just 1 of the forms I know of this. Other forms of noodles I know may be: Mỳ phở (manga), Mỳ tôm (instant noodles, the shrimp is mentioned maybe cause earlier design of the Vietnamese instant noodles is Miliket, which had a few shrimps on the cover), Bún (you can see this served in Bún chả, bún riêu cua, bún đậu, bún bò Huế), bánh phở (dunno how to visualize the difference, just think of this as the Phở's noodles being served in rectangular blocks), bánh đa nem (the outer layer of Chả Nem if you ever stumble in one, it is hard normally but softens after dipped in water, we fill 1 side with ingredients, package the whole thing then deep-fry them to make Chả Nem)
Sorry if my rambling seems long, but I'm so excited to see my country's delicacy in manga, they are truly tasty, please do try out them all