Perhaps you should try some spelling variations:
sang minh » kang minah, anh minh, song min
yang yang » wang yang, wang yan
hong than » hong tan, long thanh
yao chai » ka chai
dan sang » dan yang, dan dana, dan qing
hong hai » shang hai, zhong tai, dang hai
hao chi » thao chi, ho chi, giao chi

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: yang yang ((yao chai) OR (hao chi)) dan sang minh ((hong hai) OR (hong than)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "yang yang ((yao chai) OR (hao chi)) dan sang minh ((hong hai) or (hong than)) ;~".
• Adding a wildcard symbol may retrieve word variants: yang yang ((yao chai) OR (hao chi)) dan sang minh ((hong hai) or (hong than)) ;*.