First, read the English article below.

Probably the most straightforward method of alleviating abdominal pain from gas accumulation is getting rid of it by passing the gas (also called flatulating or farting). Most peoples and cultures regard passing gas in public as bad manners, so be discreet about it and go to the bathroom to pass gas. To help facilitate passing gas, go for a leisurely walk outside and/or lightly massage your abdomen in a downward manner, which may help push the gas out of your large intestine.  The gas produced by fermenting bacteria in your large intestine is a combination of nitrogen, carbon dioxide, methane and sulfur compounds — which contribute to the foul odor.  Flatulence often becomes more common with age, often due to a decreased production of digestive enzymes. Another way to pass gas, albeit from the opposite end, is by burping or belching. Although you don't make much impact on lower intestinal gas by belching, it can certainly get rid of excess gas in the stomach and upper intestinal tract. Accumulation of air in the stomach can occur from gulping liquids or eating food too quickly, drinking through a straw, chewing gum and smoking. The accumulated air can be relieved easily, quickly and painlessly by belching. Although drinking too much carbonated liquid can cause bloating, a few sips of something fizzy is helpful for promoting belching and gas release.  Natural remedies sometimes used to encourage belching include ginger, papaya, lemon juice and peppermint. Much like passing gas, many peoples and cultures (but not all) regard loudly belching in public as bad manners, so act accordingly. Some foods have a tendency to create intestinal gas because they are difficult to digest or contain compounds that irritate the stomach or intestines. Common gas-causing or bloating foods include beans, peas, lentils, cabbage, onions, broccoli, cauliflower, prunes, and mushrooms. Eating too much insoluble fiber (found in most veggies and the skins of some fruits), fructose sugar (found in all fruit, particularly sweet berries)... 

Now, please write a short abstract for it in Vietnamese. Abstract:
Đừng ngại đẩy khí ra ngoài. Cố gắng giảm cơn đau bằng cách ợ hơi. Tránh thực phẩm gây đầy hơi. Ăn thức ăn không làm tăng đầy hơi và đau bụng do chướng bụng. Tránh chế phẩm từ sữa động vật nếu bạn không dung nạp lactose. Hòa 1-2 thìa cà phê muối nở vào một ít nước.