Indeed. The search function is mostly intended for title and tagline searches. If you want to search by tags, it's best to use the actual tag system. Free text search kinda-sorta works on tags too, sometimes, but as you've seen is unreliable.
Viewing post in Game not showing up in searches
Ok, so how can I use/improve tags to make my game update be visible? What's "the actual tag system"? I'm using game tags and I'm searching through "Select a tag", not "Search for games and creators", which is not the best choice for tag search.
I've just tested it again using "nsfw" tag in the "Search a tag", narrowed the search to 7 days and 1 day - my game is not showing up (it has "nsfw" tag). Two other games, which were posted 1 day ago and 1 hour ago are on the list. So what can be done about this?
That's what I meant: the way you can select tags when browsing for games or directly. Speaking of which: when browsing the adult tag, your game is on the first page of results, if all the way to the bottom. When browsing for NSFW, it's on the second. I couldn't say why it's not working for you.