Perhaps you should try some spelling variations:
long thanh » luong thanh, long trinh, truong thanh
yang guang » yang yang, yan guan, yang liang
wang yang » wang yan, wang liang, wang yanling
yuan wang » yan wang, yuan chang, qian wang
yuan kang » yuan chang, chan kang, yuan kai
long han » long chain, long haul, jeong han

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 yang guang chih ((yuan wang) OR (yuan kang)) lin ((long han) OR (long thanh)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang yang guang chih ((yuan wang) OR (yuan kang)) lin ((long han) or (long thanh)) ;~".
• Adding a wildcard symbol may retrieve word variants: wang yang guang chih ((yuan wang) OR (yuan kang)) lin ((long han) or (long thanh)) ;*.