These are the instructions to set Google Drive (Docs) in English. Because we are in Vietnam, Google by default will select Vietnamese the first time you use some of their tools.
First click on the Settings icon (looks like a mechanical gear), on the right side of the page. Then click on the fourth option of the menu. Here is an image of that (click the image to see it larger):
Finally, in the Google Documents Settings screen, the top-most drowdown controls the language settings. Select the language that you want ("English (US)", probably?), and click at the bottom of the page, on the "Luu" button ("OK"):
Done! Your Google Drive should now show in English.