How do I show and track what search keyword does my users search to visit my post? I want to show the keyword in the post.
Google analytics (GA) is the easiest free way to do this. You will need to install the tracking code into each page. Then you can check GA reports and it gives you visitors by keyword and a whole range of other stuff that is very useful. For anyone looking to make educated decisions about anything to do with their website, GA is a must!!
I think my question was misunderstood. In my posts, I want it to say "Hello User, you found my blog searching for the keyword "keyword"!" How can I do that with wordpress?
There is a plugin for that at the wordpress dot org site. You may have to play with how you search for it, but I remember seeing one in there but you will also need to check which version it was tested up to. Some of the plugins have not been tested for the newer versions of wordpress.