Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
hanh nam » thanh nam, hanh lam, hanh ngay
chat duc » chat xuc, chat doc, chet duoc
van chat » cao chat
hieu van » hieu va, thien van, lieu va
va hanh » van hanh, va thanh, va danh
tu sach » thu sach, su sach, te sach
y nang » ky nang, ly nang, v nang
so hai » son hai, su hai, so ha
o hai » co hai, o lai, _ hai
o hoi » co hoi, o hoc, 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: tu sach y nang ((o hoi) or (((o hai) or (so hai)))). hieu van chat duc va hanh nam va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ((o hoi) OR (((o hai) OR (so hai)))). hieu van chat duc va hanh nam va triet.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ((o hoi) or (((o hai) or (so hai)))). hieu van chat duc va hanh nam va triet*.