Perhaps you should try some spelling variations:
yunnan china » urban china, tuan china, wuhan china
yan yunnan » yan yuan
china data » china update, chinese data
data yang » apa yang
shang hai » shang kai, dang hai, chang ha
yang lin » yang jin, wang lin, yang li
wan yan » wang yan, nan yan, wai yan

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: wan yan yunnan china data yang lin ((hong tan) OR (shang hai)) ;~.
• Adding a wildcard symbol may retrieve word variants: wan yan yunnan china data yang lin ((hong tan) or (shang hai)) ;*.