A group of strangers come across a man dying after a car crash who proceeds to tell them about the $350,000 he buried in California. What follows is the madcap adventures of those strangers as each attempts to claim the prize for himself.
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SubDL has 2 Vietnamese subtitles for It's a Mad, Mad, Mad, Mad World. Each one is a separate file timed to a particular video release, so pick the entry whose release name is closest to your copy.
Match the release name to your video file. The Vietnamese files here cover releases such as It's a Mad Mad Mad Mad World_Bluray (bản 159 phút), It's a Mad Mad Mad Mad World_Bluray (bản 197 phút). If none matches exactly, choose the one with the same source (WEB-DL, BluRay, HDTV) and resolution — those usually share the same timing.
Download the .srt and put it next to the video file with the same name, and most players load it automatically. In VLC use Subtitle - Add Subtitle File, in Plex and Jellyfin upload it from the item's subtitle menu, and in Stremio pick it from the subtitle button during playback.
A constant offset means the subtitle was timed to a different release: shift it with G and H in VLC, or J and K in MPV, until the first line matches. If the drift grows through the film, the frame rate differs and a file from the same release group is the better fix.
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