Perhaps you should try some spelling variations:
yong yuan » yong susan, fang yuan, meng yuan
yuan wang » yan wang, yuan kang, yuan chang
shang hai » shang kai, dang hai, chang ha
wang tan » wang ban, wang dan, wang tao
tan yong » tan hong, tan kong, tan yang
hong ng » hong kong, hong jong, hong hong
yan di » yang di, pan di, yan zi

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 tan yong yuan wang yan di ((shang hai) OR (hong ng)) ;~.
• Adding a wildcard symbol may retrieve word variants: wang tan yong yuan wang yan di ((shang hai) or (hong ng)) ;*.