Perhaps you should try some spelling variations:
ban hang » ngan hang
nang ma » tang ma, sang ma, nang cao
hieu he » hieu ve, hiem he, hieu le
dao duc » giao duc, tao duoc
va tinh » may tinh
doi cua » dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky
ma hoi » mai hoi, xa hoi, ma hoa
he dao » de dao, he dai, he dan

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sac ky nang ma hoi. hieu he dao duc ((ban hang) or (va tinh)) doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky nang ma hoi. hieu he dao duc ((ban hang) OR (va tinh)) doi cua tre*.