First, read the English article below.

There is no scientific evidence that has proven that increasing the number of immune-fighting cells is a good thing. In fact, in some cases, increasing the number of certain "good" cells in your body can increase the risk of stroke.Medically speaking, the best thing you can do for your immune system is to live a healthy daily lifestyle and get proper and timely medical treatment for illnesses and infections. Zinc is one of the most important components of enzymes present in white blood cells, and a deficiency of this mineral can result in a weaker immune system. You can get zinc from meat, fish, and milk. Supplements are also available, but you should consult your doctor before taking them regularly. You only need a very small amount of copper to be healthy (the total amount of copper in a healthy human body is only around 75-100 milligrams ), but it does play a very important role in metabolic and immune function, neutralizing free radicals and possibly even reducing some of their harmful effects  You can get copper from organ meats, leafy green vegetables, and cereals. That being said, too much copper can cause it to act as a pro-oxidant in your body, and in larger quantities it may contribute to the development of Alzheimer's disease. As such, you should exercise caution and be sure to check with your doctor before increasing your copper intake. Vitamin C increases your white blood cell count and enhances the cells' effectiveness. It is also an antioxidant, which means that it prevents the destruction of existing white blood cells. In addition to supplements, you can get vitamin C from oranges, berries, and most citrus fruits. For adults, tolerable upper intake levels of vitamin C are about 2,000 mg . Vitamin A is also an antioxidant, and helps your immune system to function more efficiently.  In addition to supplements, you can get vitamin A from carrots, tomatoes, chilis, and squash. Vitamin E, like vitamins C and A, is an antioxidant, and is also beneficial for your skin and eyesight. In addition to... 

Now, please write a short abstract for it in Vietnamese. Abstract:
Cẩn thận với các sản phẩm "nâng cao hệ miễn dịch". Tăng cường bổ sung kẽm. Đảm bảo nạp đủ đồng. Nạp đủ vitamin C. Lưu ý tới vitamin A. Uống vitamin E. Thử dùng các liệu pháp khác. Cân nhắc dùng thực phẩm bổ sung sữa non. Nói chuyện với bác sĩ về việc tiêm immunoglobulin.