Perhaps you should try some spelling variations:
yang wang » yan wang, yang guang, yang liang
yang yang » wang yang, wang yan
duong van » cong van
duong anh » dang anh, trong anh
china hui » china hubei, china how, china has
congo a » congo _, congo 1, congo 2
hui le » hai le, hui li, qui le

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

• Performing a fuzzy search may retrieve terms with similar spellings: wang ((yang wang) or (yang yang)) hui le ((((duong van) OR (duong anh))) or (congo a)) china hui ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang ((yang wang) OR (yang yang)) hui le ((((duong van) OR (duong anh))) OR (congo a)) china hui ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang ((yang wang) or (yang yang)) hui le ((((duong van) OR (duong anh))) or (congo a)) china hui ;*".