Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh via » hanh vi, hanh va, anh va
via cua » gia cua, gian cua, giau cua
va hanh » van hanh, va thanh, va danh
cao duc » dao duc, cao suc, giao duc
hieu ve » hieu va, hieu van
tu sach » thu sach, te sach, tu cach
su sach » so sach, vu sach
ve cao » va cao, ve bao, ve cac
y nang » ky nang, ly nang, v nang
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: ((tu sach) or (su sach)) y nang ((x hoi) OR (o hoi)). hieu ve cao duc va hanh via cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) y nang ((x hoi) OR (o hoi)). hieu ve cao duc va hanh via cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (su sach)) y nang ((x hoi) OR (o hoi)). hieu ve cao duc va hanh via cua triet*".