First, read the English article below.

Once you've bleached your hair, you're ready to tone it. Just like with the bleaching process, you should wear old clothes and gloves. Have a stack of towels handy and make sure your hair is completely dry before starting. You can tone your hair directly after bleaching it (just make sure the bleach is washed out first!). You will also likely want to tone your hair every couple of weeks in order to keep it looking white. If your toner comes premixed and ready to use, you can skip this step. In a clean plastic mixing bowl, mix the toner and developer according to the instructions on the packaging. The ratio is usually 1 part toner to 2 parts developer. Use your tinting brush to paint your hair with the toner, following the same technique as when you applied the bleach (ends to roots, back to front). Work your hands through your hair to ensure that the toner is saturating your hair and evenly applied. Use a mirror to have a look at the back of your head to make sure the toner is fully covering your hair. Allow the toner to sit in your hair for the length of time specified on the packaging. Depending on the strength of the toner and the color of your hair, it could take as little as 10 minutes for your hair to go white. Depending on the type of toner you use and how on light your hair already is, the toner could work more quickly or slowly than expected. Check your hair every 10 minutes to ensure that you don’t end up with blue hair: use a towel to scrape some toner off a thin strand of hair to get a sense of what color it’s going. If your hair’s not the desired color yet, reapply toner to that strand and put it back up beneath the plastic cap/wrap. Run your hair under cool water until all traces of the toner are gone. Shampoo and condition as normal, and gently squeeze the water from your hair with a clean towel. Let your hair air dry or, if you are impatient, dry it with your blow dryer’s coolest setting. Now that the bleaching and toning processes are complete, your hair should be a bright, sparkling white.... 

Now, please write a short abstract for it in Vietnamese. Abstract:
Chuẩn bị cân bằng màu tóc. Trộn toner. Thoa toner lên tóc ẩm. Đảm bảo toner được thoa đều. Quấn tóc trong màng bọc thực phẩm hoặc nón trùm đầu. Kiểm tra tóc 10 phút một lần. Gội sạch toner. Kiểm tra tóc.