Perhaps you should try some spelling variations:
wang yang » wang yan, wang liang, wang yanling
yang sun » yang jun, yang yun, gang sung
oil cake » oil cakes, oil takes, oil age
hong hai » shang hai, zhong tai, dang hai
wong yue » wang yue, hong yu
oil can » oil chad, oil coal
yang li » yang lin, yang di, yang xi

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

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