Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
cua triet » cua viet, su triet, va triet
viec cac » vien cac, viec cua, viec lam
hanh lai » hanh lam, hanh tai, thanh lap
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
xuc van » duc van, vuc van, xuc ban
luc van » luoc van, luu van, duc van
lai cua » dai cua, hai cua, lai chau

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