Perhaps you should try some spelling variations:
douglas john » douglas jones, douglas j, douglas o
douglas bin » douglas b, douglas mair
wang liang » wang yang
yang lin » yang jin, wang lin, yang liang
yang li » yang di, yang xi, yang yi
thing » things, think, thin
zeng » eng, feng, peng

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: wang liang ((yang lin) OR (yang li)) last thing zeng ((douglas bin) OR (douglas john)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang liang ((yang lin) or (yang li)) last thing zeng ((douglas bin) OR (douglas john)) ;~".
• Adding a wildcard symbol may retrieve word variants: wang liang ((yang lin) or (yang li)) last thing zeng ((douglas bin) OR (douglas john)) ;*.