The first thing a guy will try to work out about you is whether or not you’re in the mood to talk. If you want a boy to talk to you, you need to look like you’re open to conversation! Many boys find it extremely attractive when a girl smiles at them. Remember not to smile too widely or you'll just look silly! A small, flirty smirk is perfect, and showing your teeth demonstrates confidence. This is another way of showing that you’re confident in yourself. You’re not afraid of being caught looking at him, and you’re not afraid of your feelings. While it’s good to make eye contact, make sure you’re not staring at him adoringly from a distance. You want to look interested and open, but not obsessed! If you’re always alone when the guy you like sees you, he might think you don’t have any friends because you’re not fun to be around. If he sees you laughing and making others laugh, he’ll be able to tell that you’re a fun girl that he should probably try to get to know.  A lot of girls do a “fake laugh” when trying to get boys’ attention, but don’t do that! It’s very obvious that the laughter is forced, and it sometimes sounds silly and obvious. It’s better to pay attention to what your friends are saying and actually respond to conversation cues. This way, your laughter will sound genuine and beautiful, and you’ll still be having fun by laughing and bonding with your friends!

How would you rephrase that briefly using Vietnamese?
Duy trì thái độ cởi mở, thân thiện bằng cách mỉm cười. Chủ động giao tiếp bằng mắt với chàng trai bạn thích. Tạo khoảng thời gian vui vẻ với bạn bè của bạn khi chàng ở cạnh bên.