Give it some time to get used to its new surroundings - about three or four days at least. Never rush your budgie. It will adapt on its own.  Stay close to the cage. Talk to it sweetly and quietly as you wait for it to adjust but do not try to handle it. It will get used to you in the course of a few days or weeks. Keep the bird in quarantine for four weeks if you have other budgies. Once you are sure that the bird is free from disease, bring the cages closer without mixing the birds. Your new budgie will slowly familiarise with these new friends. Avoid loud noises and screams. Your budgie is likely to be stressed by this new environment. Name your budgie. Say it often, especially when you feed it, so that it get used to its new name. Your budgie might be overwhelmed if there are too many people around. Bring your family members once at a time and make them repeat its name. Let your household feed the bird to gain its trust.  Be careful if you have another pet, especially a cat or dog. Cats and dogs are natural predators and they are likely to find your budgie suitable for their next meal. Keep the cat or/and dog in another room at all times to avoid any unnecessary stress. Dogs are also likely to get excited, and may accidentally or purposefully hurt your bird. Their bark can also frighten the budgie. Check that your children treat the bird with respect. Little children can get overexcited when they have a new pet. Always make sure to be in the room when they look at the bird. Don't let them hit the cage or try to grab the budgie. Put your hand in the cage after a few days. Just place it there and don't move it for some time. Repeat this for some days, to allow your budgie to get used to you.  When the budgie seems okay with your hand, place your finger inside the cage. Then push it slightly against your budgie's chest. This will encourage it to climb on your finger. Do this for some days. Feed your budgie from your finger. Dip your finger in water and put some millet grains on it. The water will make the...

TL;DR in Vietnamese:
Đảm bảo chú yến phụng phải thoải mái khi về nhà mới. Cho vẹt quen dần với mọi người trong gia đình. Tìm cách lấy lòng tin của chú vẹt. Hai đến ba tuần đầu tiên, bạn đừng giữ vẹt trong tay quá lâu. Luôn đối xử yêu thương và nhẹ nhàng với yến phụng.