There could be a number of reasons why but the main reason will be due to your filters.
If you navigate to your library, on the left you will see the below 
This will control what you can view within the library and by default the "Setting" and "Roles" will be set to your schools setting (Primary, Secondary etc.) and your role that you select within your profile.
Click here for a guide on how you can change the job role.
If your filters are all deselected and your still unable to find a course, please contact our support team and we can check to see if there is anything wrong with the course.