Perhaps you should try some spelling variations:
dong yang » dong hoang, wang yang, dan yang
yang yang » wang yang, wang yan
sang minh » kang minah, anh minh, song min
ka chuan » say chuan, hai chuan, ka chai
yang jin » yang jie, yang jun, ying jin
hong yu » wong yue
ka hua » ya hua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((dong yang) OR (yang yang)) ((ka hua) or (ka chuan)) rene ((yang jin) or (sang minh)) hong yu ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((dong yang) OR (yang yang)) ((ka hua) OR (ka chuan)) rene ((yang jin) OR (sang minh)) hong yu ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((dong yang) OR (yang yang)) ((ka hua) or (ka chuan)) rene ((yang jin) or (sang minh)) hong yu ;*".