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Ốc tỏi = Japanese bonnet snail (Facebook, Wild Fact Sheets, images, more images) or in Latin: Semicassis bisulcata (Wikipedia). Ốc tỏi is sometimes refered to as "garlic snail" (Hong Hai, Cooky), but this is obviously different from garlic glass snail, which is a land snail (Wikipedia).
Here on Facebook are Vietnamese/English translations for more than 100 types of seafood, including Ốc bông and Ốc tỏi.