When you use a website's built in search to find something and it gives you any article with any of the words searched for. Example: I was curious about what kotaku might have to say about GTA V being released on xbox On Demand. I search "on demand" (with quotes) and I get anything with either word "on" or "demand."
The workaround is easy (use google to search site:kotaku.com "on demand") but it's still a little annoying. Why even offer a search option. They should just have the search box route to google.