Think of people you know who are self-confident. These people can be models for you to emulate on acting confident. You might choose a parent, teacher, or even a celebrity. Observe this person’s actions, speech and body language. Imitate these behaviors until they become your own. Being friendly to others and smiling makes you appear confident. It makes people believe that you’re a nice and happy person who enjoys being around other people. In turn, they will want to be around you.  Participating in a variety of different activities will give you the opportunity to be friendly and display your confidence. Introduce yourself by name to other people. This will give them the impression that you respect yourself and you are worth listening to when you speak. Confident people don’t over-talk, chatter, or say too much. They speak appropriately and listen to other people, engaging in conversation in socially appropriate ways.  For example, don’t constantly talk about yourself. When you constantly talk about your achievements, people start to think that you’re looking for approval and acceptance. A confident person doesn’t try to seek much external approval. Instead try asking other people about their achievements and lives! Accept compliments graciously. When people give you positive feedback, thank them and accept the compliment. Confident people know that they are worthy of compliments and respect. Don’t self-deprecate by saying you’re not good at something, or acting as though your success was just lucky. Confident people usually don’t appear anxious or nervous. Making small adjustments to your body language can convey confidence, despite what you might be feeling inside.  Stand up with your back and shoulders straight. Make eye contact when you’re talking with someone. Don’t fidget. Relax tension in your muscles. When you meet someone new, make eye contact and give a firm handshake. This will convey that you are confident and interested. Use a clear, confident voice when you speak. When your voice is timid or...

How would you rephrase that briefly using Vietnamese?
Tìm một vài ví dụ về người tự tin. Thường xuyên mỉm cười và cư xử thân thiện. Trò chuyện và lắng nghe một cách phù hợp. Sở hữu ngôn ngữ cơ thể tự tin. Bắt tay thật chặt. Nói chuyện một cách thận trọng và rõ ràng. Ăn mặc một cách tự tin và phù hợp. Cất lên tiếng nói của riêng mình. Không nên chỉ trích bản thân trước mặt người khác. Hình dung rằng bạn đang trong một tình huống khác. Khen ngợi người khác. Hít thở sâu. Ngoài ra, không bao giờ được nói xấu sau lưng người khác.