Perhaps you should try some spelling variations:
wang yuhan » wang luhang, wang yan, wang yidan
yuhan fei » yuan fei, han fei, yan fei
can past » can east, can fast, can post
can lost » can cost, can lose, can post
non cash » von cash, bond cash, non cause
oil coal » oil cost, oil oil, oil chad
oil can » oil cake, oil chad

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 yuhan fei ((((can past) OR (can lost))) OR (non cash)) sharing ((oil can) OR (oil coal)) du ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang yuhan fei ((((can past) or (can lost))) or (non cash)) sharing ((oil can) OR (oil coal)) du ;~".
• Adding a wildcard symbol may retrieve word variants: wang yuhan fei ((((can past) or (can lost))) or (non cash)) sharing ((oil can) OR (oil coal)) du ;*.