Yep. We know we need to make the search better (and in general help facilitate finding Alliances!). There were some small server side improvements over the course of the last few weeks, but the overall fix will have to come after the next big release. The best solution is to participate in the Alliance Forum, and we'll be running some Facebook posts to advertise your Alliances as well. I wish I had a better answer than "it's on the list", but...it's on the list.
We're also looking to take steps to make sure alliance membership is up to snuff (i.e. your alliance has the same number of members on every page, and they are all verified members). That is something we are looking at doing sooner; depending on how pervasive that issue is. If/when that happens, I will update so that players know why things are changing.