Perhaps you should try some spelling variations:
yang qian » yang qixian, yang liang, wang qiao
cheng dan » cheng han, cheng guan, chen tan
duong van » duong anh
su cheng » yu cheng, siu cheung, _ cheng
dan qing » dan yang, der qing
cong van » congo can, cong sun
dean » dewan, jean, den

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

• Performing a fuzzy search may retrieve terms with similar spellings: (wan or lang) ((yang qian) or (yang dean)) su cheng dan qing ((cong van) OR (duong van)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (wan OR lang) ((yang qian) OR (yang dean)) su cheng dan qing ((cong van) OR (duong van)) ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(wan or lang) ((yang qian) or (yang dean)) su cheng dan qing ((cong van) OR (duong van)) ;*".