Perhaps you should try some spelling variations:
duncan chin » duncan colin, yunnan china
chin chang » china chang, chain change, china zhang
chang hsun » chang ch'un, chung hsuan, chang su
hsun chen » hsu chin, hua chen, yun chen
yang july » yang judy, yang jun
dang hadi » dang hai
yang jui » yang judy, yang xi, yang yi

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: duncan chin chang hsun chen ((yang jui) OR (((yang di) OR (yang july)))) dang hadi ;~.
• Adding a wildcard symbol may retrieve word variants: duncan chin chang hsun chen ((yang jui) or (((yang di) or (yang july)))) dang hadi ;*.