Know-it-alls generally fall in one of two categories (or a combination of the two). Some know-it-alls have a deep sense of insecurity, and they try to cover it up by knowing as much as they can. Others actually do think they know it all, so they feel compelled to offer their knowledge to others. Knowing where the person's argumentativeness stems from can help you better deal with situation.  When an insecure know-it-all is told they are wrong about something, it plays into their insecurity, and their defenses go up. Try leading questions instead, which work well with this type of person. With the second type of know-it-alls, it's often best to let them have their say, and then try to offer up another opinion. Before diving into an argument with a know-it-all, it's important to think about what you're willing to lose. That is, think about how important the relationship is to you and how important the argument is to you. No matter how careful you are, engaging in an argument can damage a relationship.  For instance, if your boss is a know-it-all, it may be best just to let them think what they're going to think most of the time, so you don't put your job in jeopardy. If the person is someone you're close to, such as a partner or close friend, decide if the argument is really worth the potential hurt. In any argument, you should have an ultimate goal. Maybe you just want them to see your side, or maybe you want them to acknowledge your hurt feelings. Whatever it is, you need to know what it is before you jump into the argument. If the argument is about something that is fact-based, always check your facts first. If you can, bring evidence to the conversation to back up your side. However, when researching, make sure to stick to unbiased sources, instead of ones that just tell you what you want to hear.

How would you rephrase that briefly using Vietnamese?
Tìm ra căn nguyên của vấn đề. Xác định xem bạn có thể mạo hiểm với mối quan hệ với người đó đến mức nào. Xác định xem bạn mong muốn điều gì ở cuộc tranh luận. Rà soát lại cơ sở lập luận của bạn trước khi bước vào cuộc tranh luận.