Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
ban thanh » ban hanh, ban hang
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
ky tang » ky nang, ky dang, kho tang
duc ban » duc tan, duc van, dua ban
cac duc » cac du, cao duc, cac dac
ve cac » va cac, vien cac
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky
me hoi » le hoi
ma hoi » mai hoi, ma hoa, va hoi

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 ky tang ((((ma hoi) OR (me hoi))) or (xa hoi)). hieu ve cac duc ban thanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky tang ((((ma hoi) OR (me hoi))) OR (xa hoi)). hieu ve cac duc ban thanh dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky tang ((((ma hoi) OR (me hoi))) or (xa hoi)). hieu ve cac duc ban thanh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: su sac ky tang ((((ma hoi) OR (me hoi))) or (xa hoi)). hieu ve cac duc ban thanh dai cua tre*.