It is likely a person with an addiction to pornography has kept it hidden from others. The process of talking allows someone to free himself from the lie of keeping secrets. Talking is extremely therapeutic and is used in many types of psychotherapy.  If the person tells you he has an addiction, then allow him to tell you his story. It is important for him to know that he is being heard. If you notice changes in the person’s behavior, then you can bring it up by saying something like, “I’ve noticed you are spending a lot more time online, and you look like something is bothering you. Do you want to talk about it?” Don’t be afraid to ask the tough, honest questions. Confronting difficult subject matter that might jeopardize a relationship is challenging. Deceit is at the root of addiction so you must tell the truth. You will need to ask direct, honest questions like, “Do you think you are addicted to pornography?” People tend to rise to a challenge when they know someone is interested in the outcome. There is a tendency to believe in yourself and your abilities when you can tell someone about your accomplishments. Accountability increases results and effectiveness. You can be the person who asks to be updated, shows an interest in the person’s success, and will call a person out if he is not living up to expectations. It will help the person attach to a process that will help end unhealthy behaviors.  You can help the person be accountable by saying something like, “I want to help you with this so I’m going to check in with you and ask you how things are going.” Offer to monitor the person’s computer activity by checking search histories on a daily or weekly basis. You must secure the person’s commitment to not delete his own search histories. An addiction to pornography carries its own sense of shame in most cultures. If a person is trying to change his behavior, additional shame and guilt is not helpful to the process. Help the person find other things that motivate positive change, rather than ridiculing...

How would you rephrase that briefly using Vietnamese?
Nói về khó khăn khi khơi dậy hành động. Làm một người có tinh thần trách nhiệm. Tránh cảm giác xấu hổ và tội lỗi. Giúp họ xây dựng hệ thống tự giám sát. Khuyến khích hoạt động thể chất. Tìm ra sở thích mới. Đề nghị tham gia liệu pháp điều trị. Tổ chức can thiệp.