Hello, Mr.Henri
There is no direct public bus from the airport to Olympic Terrace Hotel. You can take bus E32 first from Airport (Ground Transportation Center) Bus Terminus to Cheung On Bus Terminus and then change to bus no.40 from Cheung On Bus Terminus to Yen Chow Street Sham Shui Po.
Or you can take MTR, first from Aiport to Tsing Yi via Airport Express and then from Tsing Yi to Nam Cheong by Tung Chung Line.