If you're looking for courses on nanoHUB, it is easy to find what you want with a search. 

There are two separate types of courses: "traditional courses" and "nanoHUB-U courses". Both are currently active, growing, and definitely worth exploring.  Here are two links to help you find the course you want.

Traditional courses

Traditional courses are found here: https://nanohub.org/resources/courses?view=tags.  
("Search visibly" only shows the older courses. Be sure to search by tags to see the complete list.)

nanoHUB-U courses

nanoHUB-U courses are found here: https://nanohub.org/courses/browse.