Is it permissible to combine the Dhuhr and Asr prayers with a delayed combination (Jam' Ta'kheer) due to the long distance (two hours there and two hours back), the tight study schedule, and the difficulty in finding a place to pray at the university?

If the distance between your home and the university is 83 km or more, then it is permissible for you to shorten (qasr) and combine (jam') prayers. However, if your intention is to spend four hours in traffic, then it is not permissible for you to shorten or combine prayers; rather, you must pray each prayer at its appointed time, unless it becomes impossible to do so, in which case combining prayers is permissible. The same ruling applies if the prayer time begins while you are in a lecture; you must ask for permission to pray in a clean place, and if that becomes impossible, then combining prayers is permissible.