First, read the English article below.

Whether you are using a neti pot, a syringe bulb, or a different irrigation device, ensure that the device has been properly cleaned. Fill the device with a saline solution that has either been store bought or made at home using sterile water. Once you've drawn water into your irrigation device, you'll need to get in place. Lean over a sink to avoid spilling water everywhere (especially water that has been through your sinus).  Tilt your head sideways over the sink. Some experts recommend tilting your head at a 45-degree angle to facilitate the best flow of water without any getting into your mouth.  When you're ready, press the spout of your irrigation device gently into the nostril that is closer to the ceiling (the "upper" nostril, when your head is tilted). Do not shove the spout deep inside the nose or against the septum, as this may cause discomfort or injury. Once you're in position and have inserted your irrigation device, you may begin to irrigate the nose. Proceed slowly and carefully, especially if this is your first time irrigating your sinuses.  Breathe through your mouth. Do not under any circumstances attempt to breathe through your nose, as this may cause water to go into your lungs and could present a choking hazard.  Slowly raise the handle of your irrigation device. If you are using a syringe bulb, you may now begin to gently squeeze the saline solution out. If you are using a neti pot, simply let the water pour slowly into the nostril. Once you've irrigated from one side, you'll need to repeat the entire procedure for the other nostril. Switch the angle of your head to put the other nostril "above" the one you just irrigated. Sesame oil used as nasal drops can help to moisten and soothe your nasal passages, and it may also help to flush them out further. Try using a nasal oil blend to lubricate the inside of your nose after you flush your sinuses. 

Now, please write a short abstract for it in Vietnamese. Abstract:
Đổ dung dịch vào dụng cụ súc rửa mũi. Vào tư thế. Rửa xoang. Đổi bên. Làm sạch xoang.