Perhaps you should try some spelling variations:
cua triet » cua viet, va triet
vanh tai » van tai, hanh tai, anh tai
su triet » su viet, su tien, ve triet
so sach » so sanh, bo sach, co sach
nang co » nang cao, nang doc, nang noi
qua cac » cua cac
y nang » ky nang, ly nang, v nang
co hoi » co hoc, co loi
xac va » tac va, ac va, bac va

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

• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y nang co hoi. hieu qua cac ((xac va) OR (duc va)) vanh tai ((cua triet) OR (su triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach y nang co hoi. hieu qua cac ((xac va) or (duc va)) vanh tai ((cua triet) OR (su triet))~".
• Adding a wildcard symbol may retrieve word variants: so sach y nang co hoi. hieu qua cac ((xac va) or (duc va)) vanh tai ((cua triet) OR (su triet))*.