In any given situation, you have rights. You do not want to give up these rights because you have to interact with a difficult person. Controlling people have a way of getting inside your head and causing you to forget your basic rights as a human being. Remind yourself you deserve to be treated decently.  Everyone has the fundamental right to be treated with respect, to be allowed to express their opinions, to say "no" without feeling guilty, and have different opinions. If you've been dealing with a controlling person long term, you may have forgotten you have these rights. Before interacting with someone, remind yourself of your rights. Keep them in mind when setting boundaries. For example, a controlling boyfriend may expect you to spend time with him instead of going out with friends. If you don't want to sit at home and watch a movie one night, a controlling boyfriend will make you feel guilty for this. As you get ready to assert your boundaries, think something like, "I have the right to say 'No' to him without feeling bad." The first step to setting boundaries is to take back your control. You cannot control another person's negative actions but you can control how you personally react to them. You have choices in regards to how you approach boundaries.  Oftentimes, people take a grin and bear it approach with controlling people. You may also work on avoiding the person altogether. You may, for example, simply not go to family events if you have to see your controlling father. Break free from these patterns. Think something like, "I'm in control of whether or not I let this happen. I refuse to be a victim." Decide you're going to make the choice to assert your independence and demand respect. Controlling people are always trying to push the limits of those around them. Controlling people enjoy knowing they've broken someone's barriers. Let the controlling person know where your personal limits are. Make it clear to them which behaviors you will and will not tolerate.  Recognize when you can and cannot...

TL;DR in Vietnamese:
Bạn nên nhớ rằng bạn cũng có những quyền cơ bản. Nói với bản thân rằng bạn làm chủ được tình thế. Vạch rõ những giới hạn. Vạch rõ ranh giới của bạn một cách thẳng thắn. Kiên định khi cần thiết.