First, read the English article below.

A normal respiratory rate in an adult is generally no more than 20 breaths per minute.  Depending on age, children can have faster resting respiratory rates. It's best to watch for any general signs of abnormally fast breathing.  Children between 6-12 years should take about 18-30 breaths per minute. Children 12-18 years should take about 12-20 breaths per minute. A child who is breathing normally mainly uses the diaphragm to breathe. A child having an asthma attack, though, may have to use other muscles in her effort to move more air. Look for signs that the child’s neck, chest, and stomach muscles are working harder than usual. A child who is struggling to breathe might assume a hunched posture, with her arms braced on the knees or a table. If you notice this posture, the child may be having an asthma attack. Children having asthma attacks often make a soft whistling, vibrating sound when they breathe. This usually happens when they exhale, as air is forced through a narrowed passageway. You may be able to hear wheezing during both inhaling and exhaling. Note, though, that in mild attacks or early in severe attacks, you may only hear the wheezing when the child breathes out. Asthma is the most common cause of chronic childhood cough. Coughing causes the pressure in the airway to rise. This, in turn, forces narrowed airways open and temporarily allow better airflow. So while coughing helps the child breathe, it's a symptom of a larger problem. Children might also cough when the body tries to expel environmental triggers that may have caused the attack.  A cough can also be a sign of a respiratory infection, which can trigger asthma. Persistent night coughing is a common symptom of mild to moderate persistent asthma in children. However, if the child coughs repeatedly for a long time, she is probably having an attack. Retractions are a visible “pulling-in” between and just below the ribs or at the collarbone as the child breathes. They occur as the muscles work hard to pull air, but the air can’t move quickly... 

Now, please write a short abstract for it in Vietnamese. Abstract:
Để ý dấu hiệu thở nhanh. Để ý xem bé có đang cố gắng thở không. Lắng nghe tiếng thở khò khè. Để ý tiếng ho. Tìm dấu hiệu co bóp. Tìm dấu hiệu lỗ mũi nở ra. Để ý dấu hiệu “ngực đứng yên”. Sử dụng lưu lượng đỉnh kế xác định độ nặng cơn suyễn.