Perhaps you should try some spelling variations:
wang liang » wang yang
liang sun » liang dan, liang tan, wing sun
shang hai » shang kai, dang hai, chang ha
oil cake » oil cakes, oil takes, oil age
wong yue » wang yue, hong yu
oil can » oil chad, oil coal
tang » tan, lang, yang

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 liang sun ((oil can) OR (oil cake)) tang li ((shang hai) OR (wong yue)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang liang sun ((oil can) OR (oil cake)) tang li ((shang hai) or (wong yue)) ;~".
• Adding a wildcard symbol may retrieve word variants: wang liang sun ((oil can) OR (oil cake)) tang li ((shang hai) or (wong yue)) ;*.