Perhaps you should try some spelling variations:
dua tren » dung tren
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hanh de » hanh ve, hanh kem
cuc ban » cua ban, cac ban, cuu ban
cuu tre » cua tre, cau tren, cau treo
xuc ban » duc ban, quoc ban, xuat ban
hieu va » lieu va, hieu qua
va cam » va cham, va cac, va cao
x hoi » xa hoi, o hoi, x ho

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 nang x hoi. hieu va cam ((xuc ban) OR (cuc ban)) hanh de ((dua tren) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang x hoi. hieu va cam ((xuc ban) OR (cuc ban)) hanh de ((dua tren) OR (cuu tre))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang x hoi. hieu va cam ((xuc ban) OR (cuc ban)) hanh de ((dua tren) or (cuu tre))*".