Perhaps you should try some spelling variations:
dong yang » dong hoang, wang yang, dan yang
yang yang » wang yang, wang yan
yang hua » wang hua, yang hui, ying hua
hua west » a west, hua wei, out west
west yan » west can, west bank, west jean
wong yue » wang yue
yan thi » yan zhi, tran thi, dang thi

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 yang hua west yan thi ((hong yu) or (wong yue)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: dong yang yang hua west yan thi ((hong yu) OR (wong yue)) ;.
• Adding a wildcard symbol may retrieve word variants: dong yang yang hua west yan thi ((hong yu) or (wong yue)) ;*.