This could be the local market in which you operate or the timing when you advertised the position. College hiring is cyclical and the earlier you get to campu

This could be the local market in which you operate or the timing when you advertised the position. College hiring is cyclical and the earlier you get to campus, the better. If you re-advertise the same position, especially after you interviewed a few fresh grads from the same university (who will talk to one another) and flunked them all, it's not surprising nobody bothered to apply. Also, keep in mind that it's not uncommon for college students to be offered full time position during their last internship (so 1+ year before they graduate). So by the time you try to hire new grads, some of the best are effectively already out of your local market.