Article in English: Use a soft rag dampened with water to gently clean the surface of the hardwood floor from any excess dirt and debris. Make sure there is no dirt or debris in the scratch as well. Before applying the wood stain to the scratch, test the marker on an inconspicuous area of the wood to see how well it matches. If it is a good match, then you can use it on your scratch. Stain markers come in many colors, and can be found in home department stores, hardware stores, and paint stores. If you are confident that the marker is a good match, then run the tip of the marker over the scratch a few times to stain it. Don’t worry if the stained area looks a little light. You can go over the area again after your rub off the excess. Lightly press a clean rag soaked in a bit of mineral spirits onto the wood, focusing on the scratched area.  Rub the area where you applied the stain to remove any residual, following the grain of the wood.  This application method works best (rather than directly drawing the stain marker over the scratch), because it allows for a gradual addition of stain. If you use the marker to draw and fill in the stain directly, you can saturate the scratch with stain, and end up making the scratch darker than the surrounding wood. Drawing straight onto the scratch like that can make the scratch mark even more obvious.

Summary in Vietnamese:
Lau bề mặt trầy xước. Thử màu trước. Dùng bút xóa trầy xước trên gỗ để tô lên vùng trầy xước. Chà xát cho màu thấm vào vết xước.