Perhaps you should try some spelling variations:
douglas john » douglas jones, douglas j, douglas o
douglas mair » douglas mary, douglas a, douglas m
wang liang » wang yang
last think » last thing, last things
think zeng » think long
yang lin » yang jin, wang lin, yang liang
yang li » yang di, yang xi, yang yi

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 think zeng ((douglas mair) OR (douglas john)) ;~.
• Adding a wildcard symbol may retrieve word variants: wang liang ((yang lin) or (yang li)) last think zeng ((douglas mair) or (douglas john)) ;*.