First, read the English article below.

You can also open the search bar by clicking the magnifying glass icon on the Charms menu. If you are not logged in with an administrator account, you may be prompted to enter the admin password now. The command is  (Get-WmiObject -query 'select * from SoftwareLicensingService').OA3xOriginalProductKey. To paste the copied command into PowerShell, just right-click the window. After a few seconds, your Windows 8 product key will appear on the next line. 

Now, please write a short abstract for it in Vietnamese. Abstract:
Nhấn ⊞ Win+S để mở thanh tìm kiếm Windows. Nhập powershell và nhấn ↵ Enter. Nhập hoặc dán lệnh truy xuất product key. Nhấn ↵ Enter.