Search Terms

I’m confused. Confused about the “info” I get from my stats here on WordPress. I wonder if anyone can explain this to me. When I check out the stats, just to get an idea about where my views come from, I usually don’t get much info out of the Search Terms (as usually it says “unknown”). I think it’s awesome to see which search engines were used but does it really matter if it was Google Search and from which country?

I get that it’s interesting to see which country looks you up, but then that should be visible in “Countries”, right? And now to my initial question: How can it be, that a search term can be “unknown”? I mean, obviously someone types something and finds my blog. So how come it’s unknown?

Anyway… not that it matters. I was just wondering why certain (and truly weird) search terms show up and others are unknown.