I'm also trying to figure out how to take advantage of this. This appears that Google is trying to let pages rank well for a variety of closely related phrases. Up until this year, best practice has been to create one page per phrase. Now it looks like you can somehow make a single page rank for multiple phrases. I'm still trying to get my wheels under me as to what you specifically need to do to make this happen.
I think that Google is probably implementing this based on the medical field. If you search for the full name of a condition then you get a very good result set from reputable sites. If you search for variations, the reputable sites aren't launching pages at each of the variations and you get more shallow content in the SERPs.
1) Use multiple keywords in the title ala "phrase one - another wording - third way" A couple years ago this really didn't work. Only the first phrase in the title seemed to matter, but I want to test it again.
2) Have a variety of internal anchor text pointing into the page.
3) Have a variety of external anchor text pointing into the page.
4) Launch the same content (or similar content) on multiple pages with different title optimizations, use the canonical tag back to the page you want to have rank for all the phrases.