Perhaps you should try some spelling variations:
china lehren » china loren, china ren
than china » tuan china, han china, wuhan china
yang jun » yang jui, pang jun, yang jin
wan yan » wang yan, wai yan, wang yang
nan yan » nan ya, wang yan, qian yan
yang xi » yang di, yang jui
yang yi » yang di, yang jui

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((wan yan) OR (nan yan)) than china lehren ((((yang xi) or (yang yi))) or (yang jun)) cong shu ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((wan yan) OR (nan yan)) than china lehren ((((yang xi) OR (yang yi))) OR (yang jun)) cong shu ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((wan yan) OR (nan yan)) than china lehren ((((yang xi) or (yang yi))) or (yang jun)) cong shu ;*".