The Vietnamese word "ngô khoai" refers to two different types of plants: "ngô" means maize (corn), and "khoai" means sweet potato. Together, "ngô khoai" can be understood as a combination of these two crops, which are commonly grown and consumed in Vietnam.
Understanding "ngô khoai" is helpful for anyone interested in Vietnamese cuisine or agriculture, as these two crops are staples in the diet and culture of Vietnam.