Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
duc van » duc va, duc tan, duc manh
hai cuc » tai cuc, hai cua, thai cua
hai cuu » hai cua, hai chu, thai cua
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
hieu ve » hieu va, hieu van
cao duc » dao duc, cao suc, giao duc
su sac » su sach, su cac
su xac » pu xac, su cac
ve cao » va cao, ve bao, ve cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sac) or (su xac)) ky tang xa hoi. hieu ve cao duc van thanh ((hai cuu) OR (hai cuc)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sac) OR (su xac)) ky tang xa hoi. hieu ve cao duc van thanh ((hai cuu) OR (hai cuc)) tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sac) or (su xac)) ky tang xa hoi. hieu ve cao duc van thanh ((hai cuu) OR (hai cuc)) tre*".