When you click on one of the search results, you will see more functionalities:
When you are in a search result (document containing the keyword), on the right side of the page you will also see the Context Panel that helps you navigate:
Contents: Table of Contents, showing where the document is in the hierarchy of the source.
Search Results: a quick look at all the search results within the current source.
Links: a list of all the documents in RIA that have referenced this particular document.