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
vai cuu » vai cua
dua ban » dia ban, cua ban, qua ban
bay dua » cay dua, chay dua
van bay » van ban, van bao, van bac
sach ky » sac ky, sach kem, sach hay
cao hoi » cau hoi, co hoi, cao hoc
sach ty » sach tu, sach thu, xach tay
cuu tre » cua tre, cau tren, cau treo

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) OR (sach y)))) nang cao hoi. hieu van bay dua ban thanh vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (((sach ty) OR (sach y)))) nang cao hoi. hieu van bay dua ban thanh vai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) or (((sach ty) OR (sach y)))) nang cao hoi. hieu van bay dua ban thanh vai cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (((sach ty) OR (sach y)))) nang cao hoi. hieu van bay dua ban thanh vai cuu tre*.