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 jui » yang judy, yang xi
ying jin » yang jin, jing ji, yang jie
yang yi » yang xi
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 jui) or (ying jin))) 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 jui) OR (ying jin))) OR (((yang di) OR (yang yi)))) dang hadi ;.
• Adding a wildcard symbol may retrieve word variants: dugan john chae yuan cheng ((((yang jui) or (ying jin))) or (((yang di) or (yang yi)))) dang hadi ;*.