Perhaps you should try some spelling variations:
yan than » van thanh, yan zhang, yan clan
than oil » than coal, than only, than one
oil rent » oil rents, oil trend, oil real
hong hai » shang hai, zhong tai, dang hai
wong yue » wang yue, hong yu
lang li » liang li, ling li, tang li
wang » wing, wan

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

• Performing a fuzzy search may retrieve terms with similar spellings: wang yan than oil rent lang li ((((hong hai) or (hong tan))) or (wong yue)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang yan than oil rent lang li ((((hong hai) OR (hong tan))) OR (wong yue)) ;.
• Adding a wildcard symbol may retrieve word variants: wang yan than oil rent lang li ((((hong hai) or (hong tan))) or (wong yue)) ;*.