Add a search bar with placeholder text: "ស្វែងរកអត្ថបទ..." (Search for article...). A huge percentage of users will use this immediately.
Technically, a "Khmer 404" error page is a web server response indicating that a user has requested a page that does not exist, but rendered entirely in the Khmer language (ភាសាខ្មែរ) with culturally relevant design elements.
If you are a webmaster or business owner in Cambodia, here is a step-by-step checklist to building the perfect Khmer 404.