During the reign of the 18th hero, the king had a beautiful daughter named Mi Nuong. The king ordered to pick a bridegroom for Mi Nuong, boys from all over the country flocked to the castle to try. But in the eyes of the king, no man is worthy to be My Nuong's husband. Suddenly, two boys came to test their skills, one was Son Tinh and the other was Thuy Tinh. Son Tinh can carry rocks arranged into hills and mountains, whichever direction he points his hand, the mountain rises to that level. And Thuy Tinh has the talent to call the rain to call the wind, it only takes one shout to make a storm and flood come, sinking all the houses. When the king saw this, he was puzzled because every guy has his own talent. After thinking about it for a while, he decided to say: "Tomorrow, whoever brings here 100 sticks of sticky rice, 200 files of banh chung, nine-mom elephants, ripe chickens, nine red-haired horses. Whoever brings enough offerings and If you come earlier, you will be able to pick up Mi Nuong." The king finished speaking, both of them returned and prepared the offerings. Early the next day, Son Tinh was at the king's door and brought enough gifts. Seeing this, the king was satisfied and agreed to marry Mi Nuong to Son Tinh. A long time later, Thuy Tinh brought her ivory, but it was too late, Son Tinh took her back first. Thuy Tinh was angry, immediately went to Son Tinh and began to call for rain and wind, only a few minutes but the water had flooded over the embankment. But Son Tinh did not give up, he began to carry large rocks to form hills and mountains. As much as Thuy Tinh raises the water, Son Tinh fills up the high mountains and hills. After a while of fighting, there was still no victory or defeat. But Thuy Tinh was tired and had to withdraw. From then on, every year to the 7th lunar month, there will be storms again. It was a sign of Son Tinh and Thuy Tinh raising flood water to fight for Mi Nuong, but every time Thuy Tinh fought, she had to withdraw because of exhaustion.

$\text{@Dey}$