A quick way to do this is to type icloud into the search bar at the bottom of the Start menu, and then click iCloud.  Use this method if you have Microsoft Outlook installed on your computer and you use it to manage your contacts. If you haven’t installed iCloud for Windows, you can get it from https://support.apple.com/en-us/HT204283. If you’re already signed in, you can skip this step. ” This adds your Outlook data to the other items that sync to your iPhone. It’s at the bottom of the window. Your Outlook contacts (and mail, calendars, and tasks) will now sync to your iPhone.

TL;DR in Vietnamese:
Mở bảng điều khiển iCloud Control Panel trên PC. Đăng nhập Apple ID. Tích vào ô “Mail, Contacts, Calendars, and Tasks With Outlook” (Mail, danh bạ, lịch và các công việc với Outlook). Nhấp vào Apply (Áp dụng) nằm cuối cửa sổ.