Each Minecraft world has a string of letters and numbers called a "seed." This determines the whole terrain layout, including the stronghold locations. Locate and copy (or write down) this string:  Computer edition: Type /seed. If commands are not enabled, turn them on first using Esc → Open to LAN → Allow Cheats → Start LAN World. Console edition: Go to the select world menu and look for the seed next to your world. (If it isn't listed there, you may need to download a seed finding tool.) Pocket Edition: Go to the main menu. Hit Play, then Edit. The seed appears underneath each world name. Create a new world set to Creative mode. On the world creation screen, enter the seed exactly as it appears. (Click More World Options first in the Computer edition.) Select the same world type as your main world. Since you're in Creative mode, you can put unlimited eyes of ender in your inventory. Use them and fly in the direction they're moving until you reach a stronghold. Since you used the same world seed, your Survival world should have a stronghold in exactly the same coordinates.  On the computer, press F3 to view your coordinates. On some Mac computers, press Fn+F3, or ⌥ Option+Fn+F3 instead. On a console, use a map item to find your coordinates. On Pocket Edition, the easiest method is to use a third-party program.

TL;DR in Vietnamese:
Tìm hạt giống thế giới. Tạo ra thế giới Sáng tạo (Creative) bằng chính hạt giống đó. Xác định vị trí của Pháo đài. Ghi lại các tọa độ x-, y- và z- của Pháo đài.