Search feature on the app is broken

(Please add an option to search for courses instead of their contents).
In a recent update, I noticed that a lot of courses were merged and all grades were combined. However, when I search for something and then click the course below the video to see all of its contents, the app crashes. When I look for the same course in the Explore tab, I can't find it.
Also, please add an option to filter by grade.