First, read the English article below.

If your face is oblong but tapers slightly from forehead to jaw, you may have an oval-shaped face. Oval faces tend to be about 1 ½ times longer than they are wide. Round faces are widest across the cheekbones, with rounded foreheads and jawlines. Another good rule of thumb is that the round face is typically about as long (measuring from hairline to chin) as it is wide (from cheekbone to cheekbone). Heart-shaped faces are widest across the forehead, and gradually narrow as you move down to the chin. The forehead should be wider than the cheekbones, and the jaw narrower than the cheekbones and the forehead.} If your face is long, widest at the cheekbones, and narrow towards the forehead and chin, you have a diamond-shaped face. Oblong faces are long, but also rounded at the top and bottom. They tend to be about equally wide across the cheekbones and jawline. Square faces tend to have a jaw that is about as wide as, or even wider than, the cheekbones. Square faces typically have a wide forehead as well. The slope from the corners of the jaw to the chin is gentle, and the chin is usually fairly wide, rather than pointy or rounded. Like round faces, square faces are usually about as wide as they are long. If you have a square jaw with a longer face, your face shape is rectangular rather than square. A square jawline can also be a feature of a triangular face. If your forehead and cheekbones are significantly narrower than your jawline, your face is triangular. 

Now, please write a short abstract for it in Vietnamese. Abstract:
Xác định khuôn mặt trái xoan bằng nét thon nhỏ. Quan sát chiều rộng ngang gò má để xác định khuôn mặt tròn. Tìm chiếc trán rộng và cằm nhỏ để xác định khuôn mặt hình trái tim. Chú ý đến vầng trán và hàm nhỏ để xác định khuôn mặt hình kim cương. Xác định khuôn mặt thuôn dài bằng cách quan sát trán và đường viền hàm tròn trịa. Nhận biết khuôn mặt vuông bằng cách nhìn vào trán và hàm rộng. Quan sát xem hàm vuông có đi kèm với khuôn mặt dài không. Định dạng khuôn mặt tam giác bằng cách nhìn vào đường viền hàm rộng.