A: Most streaming sites offer Vietsub (Subtitles). Thuyết Minh (Voice-over) is rarer for this show as it was primarily broadcast with subs on Vietnamese cable TV channels like SCTV or HTVC.
Because official Vietsub for older Nickelodeon shows is inconsistent, Vietnamese fan communities have stepped up. Search Facebook groups like "Victorious Vietsub" or "Nickelodeon Vietnam Fanclub." These groups often share .srt subtitle files that you can pair with video files you already own (using VLC Media Player). Victorious Season 3 Vietsub