I was able to find a PDF in Khmer language(a.k.a. Cambodian language). However, when I tried to upload it into my kindle, it turns everything into gibberish. I've looked around and there aren't many resources when it comes to uploading Khmer books into kindle.
I tried using Calibre and also to transfer the book by pasting it directly into the Kindle's download folder, but it sorts of translate everything into English gibberish. I believe I need to manually add the language in first, but I'm not sure how.
Some said the kindle will know what to download when you upload a foreign language book, but it's not working in my case.