Often, autistic people have problems with sensory input; they hear, feel, and see things much more intensely than others do. It is as if the volume for everything has been turned up.   Turn off distracting devices like TVs or radios (unless the autistic person tells you that they want it on). Try dimming the lights. Let them hide in small places if they want. For example, if they want to hide in a closet or shut themselves into a cupboard with their phone, let them. (Just make sure that they can get out on their own.) Hold them, rub their shoulders, and show affection. Use firm touch, instead of light touch, because this is more reassuring. It could help them calm down. If they say or show they don't want to be touched, don't take it personally; they simply can't handle touch at the moment.  You can offer a hug by spreading your arms and seeing if they come to you. If you hug them, and they stiffen or push away, let them go. Maybe they aren't able to handle the sensory input of hugging right now, or maybe your clothes have a texture that's uncomfortable to them. Many autistic people have benefited from massage therapy. Help them into a comfortable position, gently squeeze their temples, massage their shoulders, rub their backs, or their feet. Keep your movements gentle, soothing, and careful. They may direct you to areas that they want you to touch, such as by pointing at their shoulders or squeezing their face. Stimming is a series of repetitive movements that are calming mechanisms for autistic people. Examples of stimming include hand flapping, finger flicking, and rocking. Stimming is a crucial self-calming mechanism during emotional distress.   If they are hurting themselves, see if you can redirect them to doing something safer (like hitting couch cushions instead of their head). Don't restrain them, no matter what they are doing. Grabbing and holding an autistic person against their will is dangerous, especially when the person is in fight-or-flight mode. Both of you could get seriously hurt during the...

TL;DR in Vietnamese:
Làm giảm tác động giác quan để giúp người tự kỷ đang bị áp lực. Chỉ động chạm nếu họ đồng ý. Thử xoa bóp người tự kỷ khi họ muốn được động chạm. Để họ lặp lại hành động nào đó một cách an toàn ở mức độ họ cần. Ngỏ ý giúp xoa dịu cơ thể họ.