Just type it into the search box? I just searched for Age of Empires 2 and see lots of videos. There aren't any full multiplayer playthroughs, but TikTok isn't a longform content platform.
Maybe tick tocks search depends on where you live? My searches turned up nothing when I tried, so I didn't see any reason to ever use it again. Localized searches might be good for some things, but it is totally horrible for finding other people interested in less mainstream topics.
This would also explain why people has so wildly different views on the site here.
