Forum Moderators: open
Merry Xmas
You need to have access to your site's log files.
If you do not have access to your log files there are outfits that will let you put a small javascript on each page that will allow them to count hits (with, in most cases, information on referrers) for you. Many are free or have a free version.
Definitely not as good as direct access to your logs, but much better than not knowing what is going on.
http*//www.google.com/search?hl=en&ie=UTF-8&oe=UTF-8&q=kw1+kw2
which tells you which search engine sent the browser plus what keywords were used.
The service I use analyses this for me and gives me tables of top keywords, as well as top referrers, top search engines etc. Not as good as having access to your logs and knowing how to analyze them, but a darn good substitute for those who do not have access to said logs.