Perhaps you should try some spelling variations:
den xiaoping » deng xiaoping, wang xiaoping, _ xiaoping
wuhan china » yunnan china
tuan china » can china, taiwan china, yunnan china
sang minh » kang minah, anh minh, song min
minh dang » minh cong, mich dann
tan sang » tan yang, tang tang, tan hong
hai » hadi, haji, hari

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: ((den xiaoping) OR (wang xiaodong)) ((wuhan china) OR (tuan china)) tan sang minh dang hai ;~.
• Adding a wildcard symbol may retrieve word variants: ((den xiaoping) or (wang xiaodong)) ((wuhan china) or (tuan china)) tan sang minh dang hai ;*.