Perhaps you should try some spelling variations:
changqi wai » change wai, changqi wu
wang yuhan » wang luhang, wang yan, wang yidan
wang yuan » wang yan, fang yuan, wang xuan
wai chung » lai chung
chung shu » cong shu, chung chi, chung h
1 china » 2 china, 3 china
4 china » 2 china

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((wang yuan) OR (wang yuhan)) kang ((1 china) or (4 china)) changqi wai chung shu ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((wang yuan) OR (wang yuhan)) kang ((1 china) OR (4 china)) changqi wai chung shu ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((wang yuan) OR (wang yuhan)) kang ((1 china) or (4 china)) changqi wai chung shu ;*".