Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu vien » hieu hien, hieu viec, thieu nien
hanh lai » hanh lam, hanh tai, thanh lap
vien cac » vien bach, vien dai, vien da
mai khoi » mai khoa, tai khoa, cac khoi
sach ky » sac ky, sach y, sach ty
xuc van » duc van, luc van, xuc ban
vuc van » duc van, luc van, thuc van
lai cua » dai cua, hai cua, lai chau
tu sach » thu sach, su sach, te sach

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 ky nang ((mai khoi) or (xa hoi)). hieu vien cac ((xuc van) OR (vuc van)) hanh lai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((mai khoi) OR (xa hoi)). hieu vien cac ((xuc van) OR (vuc van)) hanh lai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ((mai khoi) or (xa hoi)). hieu vien cac ((xuc van) OR (vuc van)) hanh lai cua triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((mai khoi) or (xa hoi)). hieu vien cac ((xuc van) OR (vuc van)) hanh lai cua triet*.