Perhaps you should try some spelling variations:
wang xinyan » wang xiuyan, wang bingnan
wang xuan » wang xiuyan, wang xueman, wang yuhan
umfang 18 » umfang 3, umfang b, umfang ii
cheng han » chen hao
umfang a » umfang 3, umfang b, umfang ii
bai cong » bai chong, yan cong, li cong
han bai » than bad, than bau

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((wang xuan) or (wang xinyan)) ((umfang 18) OR (umfang a)) cheng han bai cong shu ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((wang xuan) OR (wang xinyan)) ((umfang 18) OR (umfang a)) cheng han bai cong shu ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((wang xuan) or (wang xinyan)) ((umfang 18) OR (umfang a)) cheng han bai cong shu ;*".