Well, if you would like to reach the university quickly, you could take a cab to go there directly. The fare should be no less than 300HK$.

Or, an economical way: Firstly, take the airport express to arrive at Hong Kong (100Hk$) and then transfer to the Island Line at Central. Get off at North Point and take the West Rail Line here to reach Hang Hau. The fare of this section is about 11.4Hk$.

Out of Hang Hau, you could take the bus 91M and 11M to reach the university directly.