Here’s a concise, helpful guide:

It looks like you're looking for a helpful post about watching Clueless (1995) with Vietnamese subtitles ("vietsub").

If you meant you already have the file and just need Vietsub subtitles, let me know and I can guide you on syncing them.

Clueless is great for learning 90s slang and casual American English. Watching with both English and Vietnamese subtitles (dual subs) can be very effective.