First, read the English article below.

This constellation, also known as Ursa Major, is the key to finding the North Star (Polaris), the star that shows you where true north is in the Northern Hemisphere. This is a large constellation, and finding it on a clear night is easy.  The Big Dipper gets its name because it looks like a large spoon and is made up of some of the brightest stars in the sky. Look up and find the collection of stars that look like this. Contrary to popular belief, the North Star is not the brightest star in the sky. Use these constellations to locate it. The outer edge, what looks like the end of a spoon, is made up of 2 stars. These 2 stars are known as “pointers,” because they literally point towards the North Star. This line should extend through the top of the spoon. The North Star sits at the end of this line. The North Star forms the end of the handle on the Little Dipper and is the brightest star in that constellation. When you think you’ve found the North Star, look around it and see if it’s part of a small, spoon-shaped constellation. If so, then you’ve located it. When you’re facing the North Star, you’re facing true north. You can now use this knowledge to figure out the other directions. Remember if you’re facing north, the other directions from right to left are east, south, and west. Sometimes the weather doesn’t cooperate with this method. In this case, you can still find the Big Dipper and estimate the distance to the North Star. The North Star is approximately 6 times the distance between the 2 pointer stars. Look at the space between those 2 stars and then multiply that distance by 6. This gives you the approximate location for the North Star. 

Now, please write a short abstract for it in Vietnamese. Abstract:
Xác định vị trí của chòm sao Đại Hùng. Tìm rìa ngoài của chòm Đại Hùng. Vẽ một đường kẻ tưởng tượng từ các ngôi “sao chỉ” hướng ra ngoài. Đứng hướng về phía sao Bắc Đẩu. Ước lượng khoảng cách nếu bầu trời đầy mây.