Perhaps you should try some spelling variations:
wang yang » wang yan, wang liang, wang yanling
yang dan » yang dean, yang fan, wang dan
oil real » oil coal, oil rent
hong hai » shang hai, zhong tai, dang hai
dan oil » can oil, dan oido, oman oil
lang li » liang li, tang li, wang li
hong yu » wong yue

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 yang dan oil real ((lang li) OR (ling li)) ((hong hai) OR (hong yu)) ;~.
• Adding a wildcard symbol may retrieve word variants: wang yang dan oil real ((lang li) or (ling li)) ((hong hai) or (hong yu)) ;*.