Turquoise contains more blue pigment than green, so try using twice as much blue paint as green paint. Feel free to experiment with different ratios, but use 2:1 as a basic reference.  Slightly more green paint—say, a 2:1.5 ratio of blue to green—will give you a deep sea-green turquoise. Slightly less green paint (than the 2:1 ratio) will mix a subtle turquoise that is nearly true-blue. Consider adding a dash of yellow paint for a brighter shade. Try a 1:5 or 1:6 ratio of yellow to blue. Mix the yellow in with the blue and the green. Add a bit of white paint if the shade is too bright. White will pale and subdue the turquoise hue so that it isn't so visceral. Once you've mixed your turquoise, you're ready to apply it. Make sure that the hue of turquoise is exactly what you want. Feel free to paint with the same brush that you used to make the turquoise, but consider cleaning the brush first for the sake of precision. If you need to replenish your turquoise supply, make sure to add blue and green in the exact same increments that you used at first. If you mix in more blue/green paint midway through, but you can't get the ratio quite as it was: consider mixing a large amount of the new hue, then painting over all of the original turquoise to even things out.

How would you rephrase that briefly using Vietnamese?
Pha với tỷ lệ 2 phần xanh dương với 1 phần xanh lá. Vẽ.