Perhaps you should try some spelling variations:
jeong yeon » jeong hyeok, jeang yean, seung yeon
change ii » change iii, changes ii, chance ii
rene sang » lee sang
sang minh » kang minah, anh minh, song min
don yuan » don juan, yan yuan
chang ii » zhang ii, change iii, changes ii
hong » long

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: don yuan ((chang ii) OR (change ii)) rene sang minh ((jeong yeon) OR (hong seo)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "don yuan ((chang ii) OR (change ii)) rene sang minh ((jeong yeon) or (hong seo)) ;~".
• Adding a wildcard symbol may retrieve word variants: don yuan ((chang ii) OR (change ii)) rene sang minh ((jeong yeon) or (hong seo)) ;*.