See the lots and lots of posts where people ask this exact same thing. Like here.
Viewing post in Please teach me to use the search function.
Thanks dude. I saw a post here recently that implied the site didn't have the functionality, and then using search just slipped my mind.
...Huh? If I read it right, this workaround doesn't let you exclude multiple tags. Oh well, one crumb is better than none, I guess. Thanks.
Edit: Does this only work if searching while logged in? I tried putting the link on my bookmarks and clicked it while logged out earlier, and it didn't work, but maybe it was something else?