Daniel, what Alex means is that only 9 items are optimally relevant (via tags and titles) for the search.
So, out of the 12,000 items, only 9 of them are both tagged and titled "soft infinity scarf" - because of this, anyone who tags and titles their item "soft infinity scarf" will be on the first page of the search.
Possibly the reason more items aren't optimized for "soft infinity scarf" is because it's not a search that a lot of people do, but it is hard to know without doing the research.