Google does it, Youtube does not.

Google will find a video when you search for a phrase that was said in it (as long as its bad speech recognition got it right), it will find a video with a text that shows up on an object with enough clarity to OCR (for example electronic component name on a pcb in the foreground). There is one plot twist - Google will not always do it when you search for VIDEO specifically :) but will gladly give you videos when searching text/images :)

Youtube search on the other hand will try

- suggest something you liked that has nothing to do with the search term entered

- popular videos at this moment

- videos mildly related to proper results. One of them had a horse in it? clearly you want more horses!

- videos with title mildly related to search term

- to ignore upload date filter when they panic (Christchurch mosque massacre).

For example YT search for "Si5351A" limited to this month will give 11 somewhat proper results mostly with "Si5351" (no A postfix) in title/description AND some dude DXing in Indonesian "Menerima Modif Radio Yaesu FTC 1540A Ke DDS System" because "Si5351A" is a "DDS" so its the same thing right? Its like when Im looking for "NSR Ro80" you should show me plenty of other cars because Ro80 is a car :). Searching for Si5351A without quote marks will show one additional video with Si5351B in the title.

Gets better, searching Google Video for Si5351A last month also gives ~11 results, but only 4 of those are direct YT links :]