Perhaps you should try some spelling variations:
dong hoang » hong hong
dong yang » wang yang, yang yang, dan yang
chan kang » chung kang, chan eng, chan fong
yang hua » wang hua, yang hui, ying hua
hua test » a test
yan tin » yuan ting, yang jin, yang lin
hong yu » wong yue

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 (dong hoang)) yang hua test ((yan tin) or (chan kang)) hong yu ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((dong yang) OR (dong hoang)) yang hua test ((yan tin) OR (chan kang)) hong yu ;.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((dong yang) OR (dong hoang)) yang hua test ((yan tin) or (chan kang)) hong yu ;".
• Adding a wildcard symbol may retrieve word variants: ((dong yang) OR (dong hoang)) yang hua test ((yan tin) or (chan kang)) hong yu ;*.