Perhaps you should try some spelling variations:
douglas john » douglas jones, douglas j, douglas o
douglas bin » douglas b, douglas mair
yuan cheng » yuan chang, huang cheng, yu cheng
yang zheng » tang zheng, wang zheng, fang sheng
jia zhang » jie zhang, jia zhangke, xiao zhang
tan yang » dan yang, tan ying, tan yong

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

• Performing a fuzzy search may retrieve terms with similar spellings: zhang ((jia zhang) or (yuan cheng)) hong tan yang zheng ((douglas bin) OR (douglas john)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: zhang ((jia zhang) OR (yuan cheng)) hong tan yang zheng ((douglas bin) OR (douglas john)) ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "zhang ((jia zhang) or (yuan cheng)) hong tan yang zheng ((douglas bin) OR (douglas john)) ;*".