you can take MTR East Rail line from University to Sha Tin and get off at exit B and take KMB bus No.263 to Tuen MunTown Plaza
Fee:$3.5+$13=$16.5
Times:9+52=61 mins(not included the waiting times and walking times)
KMB bus No.263 information:
http://www.kmb.hk/chinese.php?page=search&prog=route_no.php&route_no=263
Or you can take East Rail line from University to Sheung Shui andchange green minibus No.44 or KMB bus No.261 to Tuen Mun Town Plaza
Fee:$4.7+$12/$13.8=$16.7/$18.5
Times:18+30/58=48-76 mins(not included the waiting times and walking times)
KMB bus No.261 information:
http://www.kmb.hk/chinese.php?page=search&prog=route_no.php&route_no=261
Green minibus No.44 information:
http://www.i-busnet.com/minibus/nt/r44.php
Hope above information can help you!