Before you do a search in the article index, increase the "Number of articles to list per section:" from the default 20. You could try 200 and you'll probably find what you need.
Well, that does seem to work. That doesn't make any sense, though... When I search for seasonic using the default setting, I get 2 results in the Do-It-Yourself-Systems and 2 results in Power.
But when I increase to 200, as you say, I get
which is much more results in the Power section, as I wanted, and more results from other sections, too. But what the hell, in the first search, those results were nowhere near "20 per section", which is supposed to be the limit. They don't even come close to 20 added up. And why were results from those other sections omitted, yet they do come up when it's increased to 200?