Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
va triet » va thiet, va trien, ve triet
ban danh » ban doanh, ban hanh, ban dan
su triet » su viet, su tien, ve triet
cong hai » cong thai, cong ha, hoang hai
hieu va » lieu va, hieu qua
xuc ban » duc ban, cuc ban, quoc ban
danh di » danh du, xanh di, danh dien
y nang » ky nang, ly nang, v nang
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach y nang ((son hai) or (cong hai)). hieu va cam xuc ban danh di ((va triet) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y nang ((son hai) OR (cong hai)). hieu va cam xuc ban danh di ((va triet) OR (su triet)).
• Adding a wildcard symbol may retrieve word variants: toc sach y nang ((son hai) or (cong hai)). hieu va cam xuc ban danh di ((va triet) or (su triet))*.