Article in English: " There will also be a numbered heat setting near the "on" switch that you can adjust to your desired heat level. The thicker and frizzier your hair, the higher the numbered setting should be. If your hair is particularly thin and brittle make sure to set your straightener to the lowest number to avoid damaging your hair. The number of sections will depend on the thickness of your hair. The key is to make sections one to two inches thick so that they can easily pass through the straightener.  Pin or clip the sections you are not using out of the way as you straighten each individual section. An easy way to do this is to pin all of the sections that you are not using on the top of your head or behind your shoulders. Then take each individual section in front of your shoulder to straighten it. However, don't burn yourself. This will usually mean that your straightener will start about 1 inch (2.5 cm) from your scalp if your hair is straight. For curly or textured hair, you should get the flat iron closer than 1 inch (2.5 cm) so that your roots won't remain curly. Go slowly so that you don't burn yourself. The heated sides should touch, with your hair resting between them. Be sure not to clamp too firmly, as this will create a ridge in the top of the hair section where you start straightening. Additionally, be sure not to hold the flat iron in the same spot for too long, as doing so will also cause a ridge to form in your hair. Your motion should be a fluid and steady sweep from the roots to the ends. The most important part of this technique is that you don't hold the straightener in any one place for too long. Doing so can damage your hair and create undesirable folds. Stop as soon as your hair is straight, but don't do more than 3 passes, as this will damage your hair. Depending on the thickness of your hair, you may only have to do this once, or you may have to run the straightener over a section of hair several times.  Smaller sections of hair will make it easier to get your hair straight with fewer passes....

Summary in Vietnamese:
Cắm điện máy duỗi và bật chế độ "on" cho máy hoạt động. Chia tóc thành nhiều phần. Đặt máy duỗi gần sát vào chân tóc của phần tóc đang duỗi nhưng cẩn thận để không làm bỏng da đầu. Kẹp máy duỗi để hai thanh nhiệt chạm vào nhau và tóc được kẹp giữa. Kéo máy duỗi xuống theo chiều dài của phần tóc. Kéo máy duỗi trên một phần tóc nhiều lần đến khi tóc thẳng hoàn toàn. Đưa phần tóc duỗi sang vị trí khác và thả phần tóc mới xuống.