Perhaps you should try some spelling variations:
chang won » chang soon, chang min, chang you
chang ann » chang min, chang yun, change annex
jeong shu » jeong su, cong shu
yang yao » yang yang, wang yan, yang yi
yao yang » yang yang
jia shen » jian she, yi shen
yi chen » jui chen

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

• Performing a fuzzy search may retrieve terms with similar spellings: yang yao yang ((yi chen) or (jia shen)) ((chang won) OR (chang ann)) jeong shu ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: yang yao yang ((yi chen) OR (jia shen)) ((chang won) OR (chang ann)) jeong shu ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "yang yao yang ((yi chen) or (jia shen)) ((chang won) OR (chang ann)) jeong shu ;*".