Perhaps you should try some spelling variations:
than china » tuan china, han china, wuhan china
yan wang » yuan wang, yang yang, qian wang
yan guan » gan guan, yan yuan, yang guang
yuan hui » yuan fei, jaan hui, tuan hua
pei yang » wei yang, hui yang, pei yun
2 long » a long, 3.2 long, 6.2 long
3 long » a long, 3.2 long, 3.1 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: ((yan wang) OR (yan guan)) ((yuan hui) OR (than china)) pei yang ((2 long) OR (3 long)) do ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((yan wang) or (yan guan)) ((yuan hui) or (than china)) pei yang ((2 long) OR (3 long)) do ;~".
• Adding a wildcard symbol may retrieve word variants: ((yan wang) or (yan guan)) ((yuan hui) or (than china)) pei yang ((2 long) OR (3 long)) do ;*.