Keyword searching (generally) works best for finding articles on a topic
If you get too many results, try limiting to a particular subject - usually there is a list of subject links on one side of the screen.
The same tricks to help you find books in the catalog, will help you find articles
(assist or help)
leachate and recirculation
navigat* (finds navigates, navigation, navigational, etc.)
Put it all together:
(assist or help) and navigat* and "virtual reality"