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

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

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