Perhaps you should try some spelling variations:
wang wang » wang yang, wang liang, wang yan
than oil » than coal, than only, than one
plant li » plant life, plant lice, plant oil
hong hai » shang hai, zhong tai, dang hai
wang yue » wong yue, wang hua, wang yan
ban oil » can oil, oman oil
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 ((ban oil) or (than oil)) coal plant li ((hong hai) or (((hong yu) or (wang yue)))) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang wang ((ban oil) OR (than oil)) coal plant li ((hong hai) OR (((hong yu) OR (wang yue)))) ;.
• Adding a wildcard symbol may retrieve word variants: wang wang ((ban oil) or (than oil)) coal plant li ((hong hai) or (((hong yu) or (wang yue)))) ;*.