How to fix failed searches
When you see failed searches in your Docs report, it means people are searching for terms that don't pull up any articles. You can resolve this problem one of two ways:
For each article you'd like to rank for specific search terms, open the article and click on the Keywords tab. Enter in the failed search term as a keyword (separate multiples with a comma) and click the Save Keywords button. Now the article will show up as a result the next time someone searches for that specific term. (Note: there is a 255 word limit in the keywords field)
Failed searches also serve as great inspiration for new articles that need to be created. If you find that people are searching for topics you haven't covered, it would likely be worth creating an article to address their questions.