It can be tempting in any argument to escalate. Emotions get in the way, and you both get angry. You let your tempers get the best of you, and the argument devolves into throwing insults back and forth or yelling at each other. Escalation is a particular problem when arguing with a know-it-all because it's likely to get on your last nerve. However, if you're going to get anywhere, you have to keep your head. If you feel yourself getting heated, take a moment to take a deep breath. It's even a good idea to ask to come back to the discussion later, so you can continue when you're both calm and collected. Your body language says as much about what you're feeling as what you're saying. If your body language says your closed off to discussion, the person you're talking with isn't going to feel as comfortable engaging with you. Uncross your arms and legs, and face the person with your body. Also, be sure to make eye contact, so the person knows you're listening. That is, even know-it-alls have to be right sometimes. When you're engaging in an argument, you have to be willing to admit you're wrong sometimes. Otherwise, the argument won't get anywhere. --to walk away. Sometimes, you'll realize that no one is going to "win" the argument. At that point, it's best to just end it. However, you still want to appear non-threatening, or else the other person will still want to keep arguing.  You could end with, "Well, I can see we're not getting anywhere. I guess we'll just have to agree to disagree." You could also say, "I'm sorry to see we're not getting any closer to agreeing on this subject. Maybe we can try again some other time."

TL;DR in Vietnamese:
Đừng khiến căng thẳng leo thang. Đừng khoanh tay. Cởi mở với quan điểm của họ. Biết khi nào và làm thế nào để rút lui!