Perhaps you should try some spelling variations:
cau trieu » cac trieu, cau triet, chua trieu
thu sach » tu sach, thuat sach, thuoc sach
cua viet » ca viet, hoa viet, cua vat
sach ky » sac ky, sach y, sach ty
va pham » van pham, va phat, va phap
va danh » va dinh, va dan, va hanh
danh di » danh du, xanh di, danh dien
x hoi » xa hoi, x ho, 5 hoi
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky nang ((x hoi) OR (o hoi)). lieu va pham duc va danh di ((cau trieu) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang ((x hoi) OR (o hoi)). lieu va pham duc va danh di ((cau trieu) OR (cua viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang ((x hoi) OR (o hoi)). lieu va pham duc va danh di ((cau trieu) or (cua viet))".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang ((x hoi) OR (o hoi)). lieu va pham duc va danh di ((cau trieu) or (cua viet))*.