Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
ban thanh » ban hanh, ban hang
mai khoi » mai khoa, tai khoa, cac khoi
hieu van » hieu va, thien van, lieu va
vai cua » dai cua, hai cua, lai cua
bay dia » ban dia, tay dia
van bay » van ban, van bao, van bac
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach kem
mai hoi » dai hoi, lai hoi, mai doi
sach ty » sach y, sach tu, sach thu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach ky) or (sach ty)) sang ((mai hoi) OR (mai khoi)). hieu van bay dia ban thanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach ty)) sang ((mai hoi) OR (mai khoi)). hieu van bay dia ban thanh vai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) or (sach ty)) sang ((mai hoi) OR (mai khoi)). hieu van bay dia ban thanh vai cua tre*".