A basic steam involves nothing but water and your skin. It doesn't require much water. Fill up a small pot with 1 - 2 cups of water and bring it to a full boil. While the water is heating up, wash your face using a gentle cleanser. Be sure to remove all of your makeup and any dirt, oil or sweat that's sitting on the surface of your skin. It's important that your skin be clean when you steam it. Your pores will open wide, and if you have dirt or makeup on your skin, it could cause irritation.  Don't wash your face with an exfoliating scrub or harsh soap. Before a steam, it's best to wash with a very mild cleanser, to reduce the chance that the steam treatment will further irritate your skin. Pat your face dry with a soft towel. If you're doing the steam treatment as part of an at-home spa treatment, pour it into a big, pretty ceramic or glass bowl. If you just want a quick steam, you can leave it in the pot. Place whatever vessel you're using on a few folded towels on top of a table.  Don't pour the water into a plastic bowl. You don't want small plastic molecules getting involved in your facial steam. Be very careful that you do not burn yourself! If you decide to leave the water in the pot, then make sure to remove it from the heat source before using it. Now's the time to add essential oils or herbs to the water to make the treatment a little special. If you add oils or herbs, the steam treatment will double as an aromatherapy session, so it will be a 2-in-1 treatment. Just a few drops of essential oils goes a long way.  Be sure to add any extras after you've taken the water off the boil. Otherwise, the scents will quickly evaporate. If you don't have any special oils or herbs, try using tea! Put a few herbal tea bags in the water. Chamomile, mint, and chai all make excellent steams. Drape the towel over your head so that it drops down on either side of your face, trapping the steam so that it concentrates near your skin. Place your face close enough to the steaming water to feel it massaging your face, but...

How would you rephrase that briefly using Vietnamese?
Đun sôi một nồi nước nhỏ. Rửa mặt. Đổ nước sôi vào bát. Thêm tinh dầu hoặc thảo mộc. Xông hơi cho da mặt với một chiếc khăn trên đầu. Làm sạch bụi bẩn trong lỗ chân lông với mặt nạ. Làm săn da mặt. Dưỡng ẩm cho da mặt.