Perhaps you should try some spelling variations:
chih zheng » chen zheng, chih hang
zheng cong » zheng rong, zheng song, shen cong
yang dang » yang guang, yang liang, yang dean
yang yang » wang yang, wang yan
hadi chih » hai chih
chong shu » cong shu
chong suk » chong yun, cong sun, yong suk

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: lang ((yang dang) OR (yang yang)) hadi chih zheng cong ((chong shu) OR (chong suk)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "lang ((yang dang) OR (yang yang)) hadi chih zheng cong ((chong shu) or (chong suk)) ;~".
• Adding a wildcard symbol may retrieve word variants: lang ((yang dang) OR (yang yang)) hadi chih zheng cong ((chong shu) or (chong suk)) ;*.