How can i look for the "not provided" keywords in google analytics and i am getting more than 50% of them every month.Please help me with this.
"Not Provided" keywords are those when are searched by the users, they were not tracked by the Google as the user is login to any of his/her Google account. As per the Google policy, Google doesn't store any cookie when the user is login. So, you cannot get information about these keywords.
the only way to get an idea about the (not provided) keywords is looking thoroughly into the keywords contained in that specific landing page... as long as the user is on a https session with google there's no way you can get to know this info, however you can still try to infer and get some idea.