Perhaps you should try some spelling variations:
yuan cheng » yuan chang, huang cheng, yu cheng
john chae » john mchale, john cage, john michael
chae yuan » chae yun, chiao yuan, chu yuan
dang hadi » dang hai
yang jun » yang jui, pang jun, yang jin
yang xi » yang jui
yang yi » yang jui
dugan » duggan, dusan, duran

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

• Performing a fuzzy search may retrieve terms with similar spellings: dugan john chae yuan cheng ((((yang xi) or (yang jun))) or (((yang di) or (yang yi)))) dang hadi ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: dugan john chae yuan cheng ((((yang xi) OR (yang jun))) OR (((yang di) OR (yang yi)))) dang hadi ;.
• Adding a wildcard symbol may retrieve word variants: dugan john chae yuan cheng ((((yang xi) or (yang jun))) or (((yang di) or (yang yi)))) dang hadi ;*.