Perhaps you should try some spelling variations:
wang yuhan » wang luhang, wang yan, wang yidan
wang wang » wang yang, wang liang, wang yan
yuhan oil » than oil
zhong tai » hong tan, hong hai, zhong zhi
oil rent » oil rents, oil trend, oil real
lang li » liang li, ling li, tang li
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: wang wang yuhan oil rent lang li ((zhong tai) or (hong yu)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang wang yuhan oil rent lang li ((zhong tai) OR (hong yu)) ;.
• Adding a wildcard symbol may retrieve word variants: wang wang yuhan oil rent lang li ((zhong tai) or (hong yu)) ;*.