If you meant you already have the file and just need Vietsub subtitles, let me know and I can guide you on syncing them.
It looks like you're looking for a helpful post about watching Clueless (1995) with Vietnamese subtitles ("vietsub"). xem phim clueless (1995 vietsub)
Here’s a concise, helpful guide:
Clueless is great for learning 90s slang and casual American English. Watching with both English and Vietnamese subtitles (dual subs) can be very effective. If you meant you already have the file