you can take KMB bus No.278X and change KMB bus No.47X
Here is the information:
Get On Point:粉嶺鐵路站
Interchange Point:城門隧道轉車站
Get Off Point:葵芳智芳街
Fee$11.5
Times:85 mins(not included the waiting times and walking times)
Or you can take MTR East Rail line from Fanling to Kowloon Tong.And then ,change Kwun Tong line from Kowloon Tong to Prince Edward.Finally,change Tsuen Wan line from Prince Edward to Kwai Fong Station and get off at exit D or E
Fee:$12.6/$6.3(for Octopus)
$14/$7(for single ride tickets)
Times:52 mins(notincluded the waiting times and walking times)
KMB bus No.278X information:
http://www.kmb.hk/chinese.php?page=search&prog=route_no.php&route_no=278x
KMB bus No.47X information:
http://www.kmb.hk/chinese.php?page=search&prog=route_no.php&route_no=47x
Hope above information can help you!