Perhaps you should try some spelling variations:
duong van » cong van, duong anh
dan china » can china, han china, dan china's
china all » china fall, china als, china small
yang july » yang judy, yang jui, yang jun
long van » cong van, long han, long span
lang hua » wang hua, wang hui, dong hua
yang xi » yang yi, yang jui

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: ((long van) OR (duong van)) dan china all ((((yang xi) OR (yang di))) OR (yang july)) lang hua ;~.
• Adding a wildcard symbol may retrieve word variants: ((long van) or (duong van)) dan china all ((((yang xi) or (yang di))) or (yang july)) lang hua ;*.