Perhaps you should try some spelling variations:
wang wang » wang yang, wang liang, wang yan
yang oil » yang zili, yang di, yang jie
plant li » plant life, plant lice, plant oil
hong hai » shang hai, zhong tai, dang hai
wong yue » wang yue, hong yu
yang yi » yang di, yang jui
yang xi » yang di, yang jui

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 yi))) or (yang xi)) coal plant li ((hong hai) or (wong yue)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang wang ((((yang oil) OR (yang yi))) OR (yang xi)) coal plant li ((hong hai) OR (wong yue)) ;.
• Adding a wildcard symbol may retrieve word variants: wang wang ((((yang oil) or (yang yi))) or (yang xi)) coal plant li ((hong hai) or (wong yue)) ;*.