so, a user on hewiki searched for a phrase, without adding quotes.
they expected the articles containing the phrase to appear before other articles (with both individual words in title and/or content), but this is not the current order, and one of these articles (the one they were actually looking for) landed in place 83 in the search results.
SUGGESTION:
try a first search pass for the precise phrase (pretending it's quoted), and if this round finds anything, give those articles significant weight, so they will appear in the first 20 at least - methinks at the very top.
we should serve better readers who do not want to deal with "syntax", like quotes, and still expect articles with precise phrase to be on top.
peace