When you're talking to the girl you like, you want to make her feel special. People like it when others take an interest in them and the girl you like is no different. Showing that you care about her thoughts will make her more interested in you, as a result.  Ask her opinion on things, even if it's something silly. For example: say you're wearing a shirt that your friend doesn't like, ask for her opinion on whether the shirt is silly or not. Tell her she's the final judge. It'll make her laugh and feel important. Pay attention to the things that she does and says, so you can ask questions about it. For example, if she mentions going rock climbing, ask her how she got started rock climbing and what she enjoys about it. People like talking about themselves, so before you jump in with stories of your own, ask her another question about what she thinks. In this day and age people have really lost the skill of listening (Really listening) to one another. Real listening is when you take the time to absorb what someone is saying rather than thinking about the next thing you're going to say or what you're going to have for dinner.  For example: even if you're at a loud party, when you're having a conversation with her, maintain eye contact, ask questions and if your mind strays, ask for clarification (you can use the loud party as an excuse: "Sorry, it's really loud in here. Can you repeat what you just said?"). To this end, when you're having a conversation with her, don't fidget with stuff, or keep looking all around the room, or keep checking your phone. She'll feel that you don't really care what she has to say. Laughter is a great way to bond with someone. This doesn't mean that you need to be the class clown (Actually, it will probably work best if you aren't). All this means is that you make her laugh and say a few entertaining things. Now, everyone has a different sense of humor and you know her best, but if you're not sure there are a few things to do that rarely fail.  Gently poke fun at yourself. You...

TL;DR in Vietnamese:
Hỏi cô ấy. Lắng nghe. Làm cô ấy cười. Trêu đùa cô ấy. Nói với cô ấy bạn cảm thấy như thế nào.