* H - Like the "h" in "hello," but with a slightly stronger puff of air.
* U - Like the "oo" in "food," but slightly shorter.
* A - Like the "a" in "father," but slightly shorter.
* NG - Like the "ng" in "sing," but with a slight nasal quality.
So, the whole word sounds like: hwahng
Let me know if you want to hear it pronounced! There are many online resources like Forvo that provide audio pronunciations of words in different languages.