Perhaps you should try some spelling variations:
zheng zhang » zhen zhang, cheng zhang, zhang zhang
qin zheng » qian sheng, bin zhang
yan yuan » yan guan, fang yuan, yan clan
fan cone » a cone, dan con
ray cone » ray cones, a cone, ray mond
nan yan » nan ya, wang yan, qian yan
wang » wing, wan, lang

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 ((yan yuan) OR (nan yan)) qin zheng zhang ((fan cone) OR (ray cone)) shu ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang ((yan yuan) or (nan yan)) qin zheng zhang ((fan cone) OR (ray cone)) shu ;~".
• Adding a wildcard symbol may retrieve word variants: wang ((yan yuan) or (nan yan)) qin zheng zhang ((fan cone) OR (ray cone)) shu ;*.