Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
hieu van » hieu va, thien van, lieu va
vai cuu » vai cua
dua ban » dia ban, qua ban, mua ban
tu sach » thu sach, su sach, te sach
van cau » van dau, van hau, van chat
sach ly » sach y, sach lo, sach ty
mai hoi » mai khoi, dai hoi, lai hoi
ly nang » ky nang, ly hang, ly vang
cuu tre » cua tre, cau tren, cau treo

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

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