which bus should i take from Ting Kau stop to Kowloon east, Hong Kong?

Well, Kowloon East is a large area. Which place do you want to go exactly?
Is it the area nearby Kwun Tong Station? If yes, you are suggested to take bus no. 234B to Tsuen Wan Railway Station. Then take Tsuen Wan Line at Tsuen Wan Station, and get off at Prince Edward Station. Transfer to Kwun Tong Line to Kwun Tong Station, Exit C2.