Perhaps you should try some spelling variations:
duggan john » dugan john, quiggin john
john chae » john mchale, john cage, john michael
yun cheng » yuan cheng, yu cheng, yun chen
yang jin » yang jie, yang jun, ying jin
yang li » yang lin, yang xi, tang li
yang yi » yang xi, yang jui
hai » hadi, haji, hari

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

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