Perhaps you should try some spelling variations:
wang wang » wang yang, wang liang, wang yan
oil plant » soil plant, coal plant, boiler plant
yang oil » yang zili, yang di, yang yi
plant li » plant life, plant lice, plant oil
hong hai » shang hai, zhong tai, dang hai
yang xi » yang di, yang yi, yang jui
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 ((yang oil) OR (yang xi)) oil plant li ((hong hai) or (hong yu)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang wang ((yang oil) OR (yang xi)) oil plant li ((hong hai) OR (hong yu)) ;.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang wang ((yang oil) OR (yang xi)) oil plant li ((hong hai) or (hong yu)) ;".
• Adding a wildcard symbol may retrieve word variants: wang wang ((yang oil) OR (yang xi)) oil plant li ((hong hai) or (hong yu)) ;*.