Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
cau tren » cu tren, dau tren, ca tren
mai hoi » mai khoi, dai hoi, mai doi
lai hoi » dai hoi, lai hoa, lai roi
cam tuc » cam xuc, cam tu, nam thuc
danh vi » dinh vi, danh di, danh va
y nang » ky nang, ly nang, v nang
tuc va » thuc va, truc va, tuc xa
va cam » va cham, va cac, va cao

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: thuoc sach y nang ((mai hoi) OR (lai hoi)). lieu va cam tuc va ((danh vi) OR (hanh vi)) cau tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach y nang ((mai hoi) or (lai hoi)). lieu va cam tuc va ((danh vi) OR (hanh vi)) cau tren~".
• Adding a wildcard symbol may retrieve word variants: thuoc sach y nang ((mai hoi) or (lai hoi)). lieu va cam tuc va ((danh vi) OR (hanh vi)) cau tren*.