What is the best way to search for old content in the forum?
I'm looking for the post about the LOL XV dungeon and team suggestions and the two-image breakdown someone created detailing what each key is for and what drops from each keyed dungeon.

I apologize for wasting a post on this, but every time I try to search all I get is that there are too many results and I cannot find what I'm looking for. How do others successfully search through forum content to find specific posts?