Green is a secondary color. To create it, you'll need to combine equal parts of blue and yellow, both of which are primary colors.  "Primary" colors exist on their own and cannot be created by mixing other colors. The three primary colors are red, blue, and yellow, but you only need blue and yellow to create green. "Secondary" colors are colors obtained through the mixture of two primary colors. Green is a secondary color because it's made from blue and yellow. The other two secondary colors are orange and violet. Pure green is a mixture of pure yellow and pure blue, but if you add more blue or more yellow, you'll create a different slightly different hue of green. The two most basic variations are "blue green" and "yellow green," which are also referred to as "tertiary" colors since they fall between secondary and primary colors on the color wheel.  Blue green is made with two parts blue and one part yellow. You could also create it by mixing equal parts of green and blue. Yellow green is made with two parts yellow and one part blue. You could also create it by mixing equal parts of green and yellow. If you want to lighten green without changing its hue, you'll need to add white. If you want to darken green, you need to add black. Light shades are referred to as "tints" and dark shades are called "shades."

How would you rephrase that briefly using Vietnamese?
Pha màu vàng và xanh dương. Điều chỉnh tỷ lệ để thay đổi tông màu. Thay đổi giá trị màu với màu đen hoặc trắng.