WassUp plugin

When using WassUp I see I get hundreds ov fisitors each day, and most of it is crap.. The WassUp plugin have an option where I can add parts of links like “sitemap.html” so it won´t count visitors from those sites.. but, even when I have added the words it should noe count, it still counts them.. anyone know why?

Is there any way to block visitors with sertain words in a visitor adress?