Perhaps you should try some spelling variations:
yang guang » yang yang, yan guan
yang liang » wang liang, yan liang, yang yang
kong john » king john, longo john, wrong john
wong john » wrong john, longo john, young john
huan jie » ruan ji
jie kang » jin kang, jie zhang, wie kann
kang kim » kanaga kim, tan kim, yong kim

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: wang ((yang guang) OR (yang liang)) huan jie kang kim ((kong john) OR (wong john)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang ((yang guang) OR (yang liang)) huan jie kang kim ((kong john) or (wong john)) ;~".
• Adding a wildcard symbol may retrieve word variants: wang ((yang guang) OR (yang liang)) huan jie kang kim ((kong john) or (wong john)) ;*.