How any combo is going to rank is going to depend more on competition than how it shakes out in the Adwords KW tool. So be sure to check how many competing pages with allintitle: "keywords in quotes". Will also depend on your
SEO and # of backlinks.
But to answer your Q you could rank for any of the 2, 3 or the 4 word combos if they aren't too competitive, make sense together, and get searches.
So for example since there aren't many competing pages for green widgets - if your domain was bestgreenwidgetprices.com you could get high for best green widget, green widget prices, widget prices, green widget or other combos. Of course no one searches for green widgets so that's not a great example, but you get the idea.