> I want to find something even a bit more niche or specific, it's completely useless.
I have a bad habit of buying (cool) old hardware without checking if someone has archived the documentation. A few times I've been burned, having stuff for the which documentation seems to have been lost to time. This is typically business / enterprise hardware from the 80s and sometimes 90s, usually for a specific industry. Typically with google, a vast amount of the results you see when searching for info on these things are sites that seemingly scrape current / old eBay listings and make them appear as listings on their own site.
With that said, I recently made such a purchase. I was excited to start hacking around with something I bought, till I realized I couldn't find any documentation online. the original company, still in business, had 0 mention of the product on their site. The few pieces I could find were old marketing materials, sales crap that wasn't overtly useful to me in the long run. I tried so many things to optimize the query, but no matter what I did, I got very few relevant results. Often google would ignore chunks of my search (even ones wrapped with "") to provide completely irrelevant results for similarly named products (I got a lot of results for a car model). It seemed odd to me that this was lost to time, as it was reportedly used by some very high profile customers back in it's day (mid-90s - early 2000s). The fact that the documentation never uploaded somewhere was strange.
After feeling rather defeated, I gave one more try and found something interesting. One of the few relevant results I found for the product was an old PDF sales paper. IIRC it was around the third result down. I went back to it, and decided to navigate to the site it was hosted on. It was a Latvian equipment reseller with the site entirely in Latvian (the PDF was English). I poked around and with google translate and was able to find a link to a user manual right next to the link that had the aforementioned sales paper. I was completely floored. Why on earth, was google able to find that sales paper, but not that user manual on the exact same sites. They were both PDF's and both had select-able and so I assume index-able. For some reason though no combination of query terms, modifiers, etc. related to the company name product name and terms related to "manual" could I get google to return this manual.
While this was a shocking find, I'm still out of luck for now. The product came in two editions, with the one difference being very important. The user manual I found was for the one I do not have, and presumably more common. I emailed the company asking if they might still have a copy of what I need, although I expect I'll get ignored or told no, given that this was a product likely retired back in the mid-2000s and was much to expensive for a consumer to afford in it's heyday. In the meantime I've done a basic teardown and have managed to learn just enough to be able to proceed in absence of docs.