First, read the English article below.

Bleeding is a common side effect of taking blood thinners because your blood won't be able to clot as well. Normally, this doesn't cause problems as long as you are careful not to injure yourself. However, you may notice excessive bleeding or bruising, which could be a sign that something is wrong. While you're probably okay, it's best to see your doctor to make sure.If you go to an urgent care center or emergency room, tell the staff that you're being treated for blood clots and are taking a blood thinner. 

Now, please write a short abstract for it in Vietnamese. Abstract:
Lưu ý đến tình trạng chảy máu nhiều khi bạn sử dụng thuốc chống đông máu.