The Vietnamese word "bộ sách" translates to "set of books" in English. It refers to a collection or group of books that are usually related by a common theme, subject, or author.
While "bộ sách" primarily means "set of books," "bộ" can refer to a set of other items or categories, such as "bộ đồ" (set of clothes) or "bộ dụng cụ" (tool set). However, when combined with "sách," it specifically refers to books.