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, lai hoi
lai roi » lai hoi, loi roi
cam luc » cam xuc, cau luc
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
y nang » ky nang, ly nang, v nang
vi cau » va cau, ve cau, di cau
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 roi)). lieu va cam luc ((va danh) OR (va 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 roi)). lieu va cam luc ((va danh) OR (va hanh)) vi cau tren~".
• Adding a wildcard symbol may retrieve word variants: thuoc sach y nang ((mai hoi) or (lai roi)). lieu va cam luc ((va danh) OR (va hanh)) vi cau tren*.