Perhaps you should try some spelling variations:
wang liang » wang yang
liang yan » liang dan, liang tan, liang ying
gong gan » gong gang, hong gang, gong min
gong kai » gong si, gong di, ong ka
gong hui » tong hui, tong shui, wang hui
wong yue » wang yue, hong yu
yan oil » can oil, oman oil, than oil

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: wang liang yan oil ((gong gan) or (((gong kai) OR (gong hui)))) li ((hong tan) or (wong yue)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang liang yan oil ((gong gan) OR (((gong kai) OR (gong hui)))) li ((hong tan) OR (wong yue)) ;.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang liang yan oil ((gong gan) or (((gong kai) OR (gong hui)))) li ((hong tan) or (wong yue)) ;".
• Adding a wildcard symbol may retrieve word variants: wang liang yan oil ((gong gan) or (((gong kai) OR (gong hui)))) li ((hong tan) or (wong yue)) ;*.