Perhaps you should try some spelling variations:
yang guang » yan guan, yang liang
long trinh » long trip, long thanh
yang yang » wang yang, wang yan
chia yuan » chiao yuan, chih yuan, chu yuan
yuan wang » yan wang, yuan kang, yuan chang
wang lin » wang li, wang qin, yang lin
long han » long chain, long thanh, long haul

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