Searchable titles in forums

There is a big issue with something like this, and here's the example I like to use for it. Let's say you want to search the Trade forums. You're trying to get a... let's say Beast Ball, since those are flying around right now. So you search Beast Ball, right? Well... how would the search tell the difference between "Selling Beast Balls" and "Buying Beast Balls"? Not to mention there are countless ways of actually writing that you have Beast Balls on offer. For instance, something like... See the issue? To a human reading this, it's clear that the writer has a Beast Ball to sell (perfect!) but how would a search system know that? It's a big issue in programming really, since it kind of relies on teaching the computer how to do a human understanding of post content, and that just really isn't possible here, sorry!