Okay, I think some of these issues are database related and because I didn’t write the crappy forums software, there’s not much I can do about it.
There are a lot of posts in the system so the search query takes a very long time. If you do the same search after you see the 404, the result should come up quickly because the query eventually finished (after the browser timed-out) and was cached.
Try using Google:
“site:www.axisandallies.org Anniversary strategy japan”