If you need specific styles like "Khmer OS" or "Mondulkiri," you must download the files from a reputable source like the Microsoft Store the font files (e.g., from SIL International for Mondulkiri). Right-click the downloaded file and select if it is a Right-click the file and select Restart Microsoft Word to see the new font in your list. Microsoft Support 2. Popular Khmer Font Families
Google designed the "Noto" (No Tofu) font family to eliminate the "square box" problem. Noto Sans Khmer is sleek, modern, and excellent for Microsoft Word documents that will be shared internationally. download khmer font microsoft word