That is a great question because their search methodology is a complete mystery and makes no sense at all. We are waiting for an explanation from DAN in their official thread. So again today I did more research and discovered the same issues and even worst cases.
For example, I have a very well established nice and short dot-org name owned for nearly 20-years which is a popular phrase and gets good traffic. When searching for it (not logged-in and no cookies in use) is appears within the top-10 results however not #1, the number 1 slot is occupied by the same length but a somewhat nonsensical and BACKWARDS word order name instead of my exact match.
In fact 9 of the 10 domains are ALL NON-EXACT MATCH with added words in front or back, or in reversed order, and even a hyphenated name (owned by BuyDomains) is within the top-10 and to make it worse my name is by far the shortest one vs the other 8 being long-tail/non-exact match.
Getting back to that (no value) hyphenated name, who in the world would prefer to buy a long tail and non-exact match hyphenated name vs a short exact match?
Why is it included in the Top-10 search results at all? It certainly does not belong there. Is it possibly because it's a BuyDomains name which may be getting unwarranted rankings because of some special deal which may require the BD domains be shown a lot?