Recognizing that you need to establish boundaries or improve them is a first step. Boundaries are an extension of love and respect for yourself and others, instead of a reaction to fear or rejection. They are the path to freedom from the need to please others in order to be loved and accepted. For example, your roommate keeps borrowing your car. She never fills up the gas tank or gives you gas money. You can’t continue to pay for all the gas. Ask yourself what you hope to accomplish with a particular boundary. You will want to define each type of boundary, physical and emotional, for different settings such as at home, at work, and with friends.  For example, you might decide that you won’t let others take advantage of you and disrespect your time and personal space. For example, you want your roommate to contribute gas money when she drives your car. Share your boundary with the people in your life. This way, they will understand your expectations and needs.  For example, tell your roommate in a calm and polite way that you need her to contribute to the car’s upkeep with gas money. If she doesn’t want to do this, then she doesn’t need to drive your car. For example, if your friends have a habit of popping in unannounced and this bothers you, tell your friends that you would like them to call first before coming over. Establishing the boundary also means that in the moment when something occurs (i.e., someone borrows something without asking), you can address it and let the person know that it is not acceptable. Speak in a calm and polite way. Tell your roommate that you would like her to ask first before borrowing your car. For many people, this is the most challenging part of having boundaries. You are not only helping others to respect your limits. You are also retraining yourself.  For example, if your roommate forgets to give you gas money, give a gentle but firm reminder. You may slip and forget, but don’t forget: this is a process. Re-establish your resolve and firmly hold your boundary. You may find...

TL;DR in Vietnamese:
Quyết định thiết lập ranh giới. Xác định ranh giới. Thiết lập ranh giới. Duy trì ranh giới. Hãy thẳng thắn. Tự chăm sóc bản thân. Loại bỏ những người thâm độc ra khỏi cuộc sống. Khởi đầu nhỏ. Kiên nhẫn khi xây dựng mối quan hệ.