First, read the English article below.

Positive affirmations can help you look at your life in a more positive light and can ease your nervousness about upcoming events. Simply thinking positive thoughts about yourself and saying them aloud can help you be a less nervous, more grounded person. They can be especially useful before you have to do something important, or right when you start feeling nervous. If you get in the habit of using them daily, you’ll be living a more calm lifestyle. Before you do something you’re nervous about, just say, “I’m prepared and worthy. I’m going to do a great job,” or “I’m going to be great and there’s nothing to worry about.” Close your eyes and try to imagine whatever it is you’re nervous about. Picture yourself walking into that room and doing your best, and having everyone around you responding positively. Picture yourself feeling calm and at peace. Open your eyes when you’re ready, and try to let this image sink in with you, as if it were a treasured memory. This may feel a bit silly, but it’s a great way of “tricking” yourself into being calmer. If you’re nervous about something you have to do first thing in the morning, then you should practice positive visualization right before you fall asleep, so your success is one of the last things on your mind. Being more confident and secure in yourself can help you feel less nervous about any problems that come your way. If you take efforts to project confidence by standing taller, replacing negative thoughts with positive ones, and feeling more sure about your decisions, you’ll be on your way to feeling more confident and being calmer in the process. 

Now, please write a short abstract for it in Vietnamese. Abstract:
Đưa ra những khẳng định tích cực. Hình dung tích cực. Xây dựng sự tự tin ở chính mình.