Source: http://www.searchenginepeople.com/blog/15061-landing-pages-keywords-ga.html
Google has been successful from hiding keywords in Google analytics. Since SSL encryption is now being the trend of latest developments in internet search, it is understandable for Google to heighten up secure search to provide more protection to users. This is good for SEO industry since most webmasters will focus more on the business side of things rather than keywords and search results.
Looking for keywords in analytics data
The first thing to do is to go to find your most popular landing pages based on amount of visitors. You can do this by going to acquisition > all traffic > channels > organic search > landing pages. Next is to open webmaster tools to check the average position of your pages in search engine. Queries data in webmaster tools also provides you with keywords that people use to search for your site.
A Case Study
An auto repair shop receives traffic from its landing page more than their homepage. They found out that the content on that post is ever green, technical and very much relevant even if it was written 2 years ago. You can use SEMRush or keywordtool.io to see what keywords are used to drive traffic on your landing pages.
When crafting a topic for your blog, sometimes it is better to look for old pages that still receives traffic and popular in organic search. These topics are the ones you need to analyze and get patterns from to create ever green content that users would search for.