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

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

• Performing a fuzzy search may retrieve terms with similar spellings: su cac ky tang ((ma hoi) or (xa hoi)). hieu ve cac duc ban thanh dai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su cac ky tang ((ma hoi) OR (xa hoi)). hieu ve cac duc ban thanh dai cua te.
• Adding a wildcard symbol may retrieve word variants: su cac ky tang ((ma hoi) or (xa hoi)). hieu ve cac duc ban thanh dai cua te*.