Perhaps you should try some spelling variations:
ban thanh » ban hanh
thien van » thi van
kho tang » cao tang
ban hang » ngan hang
cua tre » cua te, cuu tre, cua triet
hoa cua » hoa chat, hoa xuat
van cao » van dao, van bao, van hao
cao duc » dao duc, cao suc, giao duc
ky dang » ky nang, ky danh
su sac » su sach, su cac, su xac

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 ((kho tang) or (ky dang)) xa hoi. thien van cao duc ((ban thanh) or (ban hang)) hoa cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ((kho tang) OR (ky dang)) xa hoi. thien van cao duc ((ban thanh) OR (ban hang)) hoa cua tre.
• Adding a wildcard symbol may retrieve word variants: su sac ((kho tang) or (ky dang)) xa hoi. thien van cao duc ((ban thanh) or (ban hang)) hoa cua tre*.