Perhaps you should try some spelling variations:
yang guang » yang yang, yan guan, yang liang
guang huan » huang juan
young john » kong john, young jean
wang yang » wang yan, wang liang, wang yanling
jie zhang » li zhang, bin zhang, xi zhang
jia zhang » jia zhangke, xiao zhang, li zhang
wong john » wrong john, kong john, longo john

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