Perhaps you should try some spelling variations:
shang hai » shang kai, dang hai, chang ha
rent ling » rent mailing
zhong zhi » zhang zhi, hong ghi, zhong tai
wing yan » wang yan, wing ian, wing tan
yuan oil » can oil, oman oil, yuan li
than oil » than coal, than only, than one
hong yu » wong yue

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

• Performing a fuzzy search may retrieve terms with similar spellings: wing yan ((yuan oil) OR (than oil)) rent ling li ((((shang hai) or (zhong zhi))) or (hong yu)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wing yan ((yuan oil) OR (than oil)) rent ling li ((((shang hai) OR (zhong zhi))) OR (hong yu)) ;.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wing yan ((yuan oil) OR (than oil)) rent ling li ((((shang hai) or (zhong zhi))) or (hong yu)) ;".
• Adding a wildcard symbol may retrieve word variants: wing yan ((yuan oil) OR (than oil)) rent ling li ((((shang hai) or (zhong zhi))) or (hong yu)) ;*.