Them's the breaks
If you have to enter quotes then they are probably blocking it, so it's not just "the breaks" like the site is simply getting buried in the results. There was a similar thread regarding http://thepeoplescube.com/ several months ago.
If you are going to say something to the effect that if it is blocked, why does it turn up with the quotes added, it is a fair question and the answer is, I don't know for sure. I believe that basically that is a glitch in their blocking mechanism that is not worth bothering with. WIth the other site, with the more unsual combination of words peoples + cube is was very clear it did not get returned in any search unless quotes were added.
I have to disagree with you there. By putting words together within quotation marks you are telling the search engine that you want pages where those particular words appear together in that particular order. Searching for "red car" might return a page with the following text:
...I just bought a new red car, I love it!
While the same search without quotes would turn up pages that have text similar to:
...I mashed the gas pedal in my car and pushed the tach into the red
Doesn't it seem likely to you that for any two given words there will be more pages on the web that contain those words, but not adjacent to one another than there will be pages where the words are adjacent?
Any competent searcher will use quotes to find it. That's how you search for anything specific. I find everything I ever need on Google. Literally, I've always found just what I need. I'd say it was pretty good that it was 5th or 6th. Just because Cotse did a overly simple search doesn't mean Google is bad.