Perhaps you should try some spelling variations:
douglas john » douglas jones, douglas j, douglas o
cheng zhang » cheng han, zhen zhang, chen zheng
douglas bin » douglas b, douglas mair
last cheng » last thing
died last » die last, der last
tan yong » tan hong, tan yang, tan ying
tan kong » tan hong
jin died » bin die

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: ((tan yong) OR (tan kong)) jin died last cheng zhang ((douglas bin) OR (douglas john)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tan yong) OR (tan kong)) jin died last cheng zhang ((douglas bin) or (douglas john)) ;~".
• Adding a wildcard symbol may retrieve word variants: ((tan yong) OR (tan kong)) jin died last cheng zhang ((douglas bin) or (douglas john)) ;*.