Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
duc minh » duc anh
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
va cham » va chat, va tham
duc van » duc va, duc tan, duc manh
y nang » ky nang, ly nang, v nang
vi cua » vai cua, di cua
o hoi » co hoi, o hai, o hoa
o hoc » co hoc, mo hoc, so hoc

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 va cham ((duc van) or (duc minh)) hanh vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang ((o hoi) OR (o hoc)). hieu va cham ((duc van) OR (duc minh)) hanh vi cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang ((o hoi) OR (o hoc)). hieu va cham ((duc van) or (duc minh)) hanh vi cua triet".
• Adding a wildcard symbol may retrieve word variants: su sach y nang ((o hoi) OR (o hoc)). hieu va cham ((duc van) or (duc minh)) hanh vi cua triet*.