It's yeu, pronounced like ew. To say it better, I suggest you not to put a tone if disgust in it since it is like what you say when you don't approve of something or have a disgust in it.
Em yêu anh (I love you - you wouldn't use the name in vietnamese for this sentance)
yêu
yeu
they taste good
See Vietnamese dictionary.
i lOVE yOU
i love you
Em yêu anh
Anh yeu em
Em yeu ong xa!
Ahh Yeu em or Em yeu ahh
Means to love someone/something in Vietnamese