Perhaps you should try some spelling variations:
chenying zhang » cheng zhang
cheung zhang » cheng zhang, cheung chan, zhen zhang
long thanh » luong thanh, long han, long trinh
wing yan » wang yan, wing ian, wing tan
yan ying » fan ying, ran ying, tan ying
ying hin » ying jin, ying hua, yun hin

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: wing yan ying hin ((cheung zhang) OR (chenying zhang)) ming ((dang hai) OR (long thanh)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wing yan ying hin ((cheung zhang) OR (chenying zhang)) ming ((dang hai) or (long thanh)) ;~".
• Adding a wildcard symbol may retrieve word variants: wing yan ying hin ((cheung zhang) OR (chenying zhang)) ming ((dang hai) or (long thanh)) ;*.