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
sach thu » sach thue, sach thieu, sach tham
vai cuu » vai cua
dua ban » dia ban, cua ban, qua ban
cay dua » chay dua, cay lua, ca dua
van cay » van cau, van bay, van ca
cuu tre » cua tre, cau tren, cau treo
sach ky » sac ky, sach y, sach kem
nang ma » tang ma, sang ma, nang cao
sach ty » sach y, sach tu, xach tay
ma hoi » mai hoi, xa hoi, ma hoa

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 thu)))) nang ma hoi. hieu van cay 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 thu)))) nang ma hoi. hieu van cay 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 thu)))) nang ma hoi. hieu van cay dua ban thanh vai cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (((sach ty) OR (sach thu)))) nang ma hoi. hieu van cay dua ban thanh vai cuu tre*.