When focus keyword is compared with Title, URL, etc, it currently requires an exact match. It might be more accurate to allow for stemmed variations, etc "Turkey yacht" would match Turkey yachting, Turkey yachts etc. Perhaps even (or optionally) slightly separated keywords such as "yachting in Turkey". I suspect Google operates this way when scoring?
It would also help if diacritics could be substituted with their ASCII equivalent before comparing with the URL string (something that WordPress already takes care of when auto-generating the URL). For example, "Café" should match with "site.com/welcome-to-our-cafe" as well as <title>Welcome to our Café</title>. That might seem like an edge case in English, but it's not so in other languages.