hệ has 1 syllables: hệ: nặng (low, short, glottalized). You can also listen to it on this page in both Northern and Southern accents.
How common is hệ in Vietnamese?
hệ is among the 500 most-used Vietnamese words, CEFR level A1.
How is hệ used in a sentence?
For example: Hệ mặt trời có tám hành tinh. (The solar system has eight major planets.); Chúng ta cần bảo vệ hệ sinh thái. (We need to protect the ecosystem.).
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