Perhaps you should try some spelling variations:
convex shu » convex set, convex sum
binh thuan » binh thanh, binh thang, binh tran
dong skin » dong sin, dof skin
bin zhang » binh thang, li zhang, jia zhang
dong bin » dong sin, dann bin
a convex » _ convex, a context
dong di » dong sin

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((dong di) or (((dong skin) OR (dong bin)))) ya hua ((bin zhang) or (binh thuan)) a convex shu ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((dong di) OR (((dong skin) OR (dong bin)))) ya hua ((bin zhang) OR (binh thuan)) a convex shu ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((dong di) or (((dong skin) OR (dong bin)))) ya hua ((bin zhang) or (binh thuan)) a convex shu ;*".