Perhaps you should try some spelling variations:
cau triet » cau trieu, su triet, cua triet
va thanh » gia thanh, ban thanh, va tinh
hieu cua » hieu qua, dieu cua, bieu cua
hai cau » hai chau, hai chu, hai hau
va hanh » van hanh, va danh, ban hanh
su sach » so sach, vu sach
cac xuc » cam xuc, cac nuoc, chat xuc
y nang » ky nang, ly nang, v nang
o hoc » co hoc, mo hoc, so hoc
o hoi » co hoi, o hai, o hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y nang ((o hoi) or (o hoc)). hieu cua cac xuc ((va hanh) OR (va thanh)) hai cau triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang ((o hoi) OR (o hoc)). hieu cua cac xuc ((va hanh) OR (va thanh)) hai cau triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang ((o hoi) or (o hoc)). hieu cua cac xuc ((va hanh) OR (va thanh)) hai cau triet".
• Adding a wildcard symbol may retrieve word variants: su sach y nang ((o hoi) or (o hoc)). hieu cua cac xuc ((va hanh) OR (va thanh)) hai cau triet*.