Perhaps you should try some spelling variations:
wang xiaobing » wang xiaoping, wang xiaodong, wang xiaolin
tuan china » wuhan china, can china, taiwan china
sang minh » kang minah, anh minh, song min
minh dang » minh cong, mich dann
tan chia » than china, can china, dan china
dan sang » dan yang, dan dana, dan qing

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: wang xiaobing ((tan chia) OR (tuan china)) dan sang minh dang (hai OR haji) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang xiaobing ((tan chia) OR (tuan china)) dan sang minh dang (hai or haji) ;~".
• Adding a wildcard symbol may retrieve word variants: wang xiaobing ((tan chia) OR (tuan china)) dan sang minh dang (hai or haji) ;*.