First, read the English article below.

Nasal washes are good for relieving nasal symptoms if you have chronic nasal issues or sinus problems. Washing the inside of your nose with a salt solution will reduce swelling, improve airflow, and open up your sinus passages. It will also remove mucus from your nose and help to relieve any stuffiness or congestion. Look for nasal wash kits at your local pharmacy or make your own salt solution using household products.  To make your own saline solution, combine 1 quart distilled water, 1 teaspoon Kosher salt and ½ teaspoon baking soda in a clean glass jar. Stir the solution and store at room temperature. Replace the solution after a week with fresh water, salt, and baking soda. Do not use tap water. If you don't have distilled water you can sterilize tap water by boiling it for at least one minute, then allowing it to cool back down to room temperature. This will kill harmful contaminates. In order to rinse your nose effectively with the salt solution, you will need a bulb syringe or a neti pot, which is a tea pot with a long spout made for your nose. You can find bulb syringes and neti pots at your local drugstore or pharmacy. Wash your hands well before you do a nasal rinse to prevent the spread of bacteria and germs. Then, fill the bulb syringe or neti pot with the saline solution. When you are using the nasal wash, you will need to stand over an area that can collect any water or mucus that drips from your nose or from the bulb syringe.  Place the bulb syringe in your left nostril and gently squirt the mixture into your left nostril. Aim the stream toward the back of your head, not the top of your head. Do not inhale through your nose as you squirt. The bulb syringe should be able to get the solution into your nose without any inhalation on your part. If you are using a neti pot, place the spout in your left nostril and tip the pot up so the solution enters your nose. If the solution does not flow out of the neti pot, lift the pot so it is positioned a bit higher than your head but do not turn your head... 

Now, please write a short abstract for it in Vietnamese. Abstract:
Mua sản phẩm dung dịch muối rửa mũi hoặc tự pha. Dùng bơm tiêm tròn hoặc bình Neti. Đứng cạnh bồn rửa hoặc bồn tắm. Cúi đầu về trước, đưa cằm về phía ngực. Rửa luân phiên hai bên lỗ mũi cho đến khi hết dung dịch muối. Rửa mũi bằng nước muối một lần mỗi ngày vào buổi sáng hoặc buổi tối.