Is there any bus at Shenzhen Bay Port to Yau Ma Tei and Mong Kok in Hong Kong?

1. Take the B2 (or B2P, ask the driver if he has arrived) bus to Tin Shui Wai subway station, take the West Rail to Mei Foo, and change to MTR Tsuen Wan Line to Mong Kok Station. Don't leave at the same station.

2. Before arriving at the port for customs clearance, a bus ticket booth asked if there was a route through Yau Ma Tei and Mong Kok. If you have a ticket, you can get on the bus directly after customs clearance.