Perhaps you should try some spelling variations:
yang guang » yan guan, yang liang
wang yang » wang yan, wang liang, wang yanling
yang yang » wang yan
pei yang » wei yang, hui yang, yi yang
yan hua » tan hua, ya hua, wang hua
pei yun » lei kyun, mei yung, wei yuan
di cong » li cong, jiu cong

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: ((((yang guang) OR (wang yang))) OR (yang yang)) yan hua ((pei yang) OR (pei yun)) di cong shu ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((yang guang) or (wang yang))) or (yang yang)) yan hua ((pei yang) OR (pei yun)) di cong shu ;~".
• Adding a wildcard symbol may retrieve word variants: ((((yang guang) or (wang yang))) or (yang yang)) yan hua ((pei yang) OR (pei yun)) di cong shu ;*.