Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
vanh tai » van tai, hanh tai, anh tai
su sach » so sach, vu sach
nang co » nang cao, nang doc, nang noi
qua cac » cua cac
tai cua » thai cua, tai cuc, tri cua
y nang » ky nang, ly nang, v nang
co hoi » co hoc, co loi
xac va » tac va, ac va, mac va
bac va » ban va, bac ha, bao 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: su sach y nang co hoi. hieu qua cac ((((xac va) OR (bac va))) OR (duc va)) vanh tai cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang co hoi. hieu qua cac ((((xac va) OR (bac va))) or (duc va)) vanh tai cua triet~".
• Adding a wildcard symbol may retrieve word variants: su sach y nang co hoi. hieu qua cac ((((xac va) OR (bac va))) or (duc va)) vanh tai cua triet*.