What are your search parameters? Remember that there's a dropdown menu for how specific you want the keywords to be: whether the results have to match all your keywords or any of them.
If you're searching for a great number of keywords then your results will be shrunk greatly, potentially to the point where there are no matches.
Google search is also probably what you want to use instead of the forum search.
I also suggest using google search rather than using the search in the forum. There you can find a much better result. I understand your struggles since I somehow search something and came empty handed or there are tons of results which are not sorted out to the most helpful and to those who are less. In Google search, you can find some of the things you want in the forum itself that is by typing the name of the forum or if you want to diversify and try other sources then that would be nice. Still, in the forum you can understand way more than those bookish definition which really hard to comprehend at some point. Also you might want to try and visit the Bitcoin Wiki. Here's the link if you want to check it out:
https://en.bitcoin.it/wiki/Main_Page