Chơi đùa cùng trẻ. Quan tâm đến những điều khiến trẻ thích thú. Hãy để trẻ diễn lại những phiền muộn đang gặp phải. Đi bộ hoặc đi xe đạp cùng nhau. Cho trẻ có thời gian ở một mình. Ôm trẻ. Gây ngạc nhiên cho trẻ bằng một số niềm vui. Thử giúp trẻ sẵn sàng đi ngủ.

I'm interested in that, but I only have a few mins. Can you give me at most the first 500 characters of a detailed explanation in English about that?
If your child is feeling sad, try playing with him. It will remind him that you love and care about him, and it might help take his mind off his problems.  If your child still plays with toys, then join him in playing with his favorites. If he's moved on to video games, try joining him for a few levels. Make sure your child has access to toys/activities that engage the senses. Some experts have found that playing with tactile materials, like clay, play dough, sand, rice, and even water can help