Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
cham tuc » nham thuc, pham thuc, tham thuc
chieu tu » chieu tro, lieu tu, chu tu
tu sach » su sach, te sach, tu cach
hanh di » hanh vi, hanh de, hang di
va hanh » van hanh, va thanh, va danh
tu cham » toc cham, thi cham
cuu tre » cua tre, cau tren, cau treo
tuc va » thuc va, truc va, tuc xa
di cuu » di cau, di cua, dinh cuu
o hoi » co hoi, o hoc, o hoa
o hai » co hai, so hai, o lai

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) or (thu sach)) ky nang ((o hoi) or (o hai)). chieu tu cham tuc va hanh di cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky nang ((o hoi) OR (o hai)). chieu tu cham tuc va hanh di cuu tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ky nang ((o hoi) or (o hai)). chieu tu cham tuc va hanh di cuu tre*.