you can take KMB Bus No.59M in Tsuen Wan Railway Station.
Get off point:蝴蝶蝶心樓
KMB Bus No.59M Details:
http://www.kmb.hk/chinese.php?page=search&prog=route_stops.php&route_no=59M&bound=2&select_from=&select_to=
Fee:$7.3
Times:37 mins(not including the waiting times)
Also,you can take KMB Bus No.59A at Kwai Fong
Get on point:葵芳
Get off point:蝴蝶蝶心樓
KMB Bus No.59A Details:
http://www.kmb.hk/chinese.php?page=search&prog=route_stops.php&route_no=59A&bound=2&select_from=&select_to=
Fee:$9.8
Times:60 mins(not including the waiting times)
Also,you can take Tsuen Wan line to Mei Foo or Nam Choeng Station and change West Rail line to Tuen Mun Station exit F to take MTR Bus No.506 to 輕鐵蝴蝶站 or 蝴蝶邨蝶心樓.But if you are in Tsuen Wan Station,you can take green minibus no.95K to Tsuen Wan West Station and take West Rail line to Tuen Mun Station and change MTR Bus to蝴蝶邨蝶心樓 or 輕鐵蝴蝶站
Fee:$10.7/$5.4(for Octopus)
$17.7/10.3(for single ride tickets)
Times:35 mins(not including the waiting times)
Fee:$15.9/$8.1
$20.9/$10(for single ride tickets)
Times:47 mins(not including the waiting times)