Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
van hanh » van thanh, ban hanh, van anh
viec cac » vien cac, viec cua, viec lam
sach ky » sac ky, sach y, sach ty
cac xuc » cam xuc, cac nuoc, chat xuc
xuc van » duc van, luc van, vuc van
lai cua » dai cua, lai chau, thai cua
hai cua » thai cua, dai cua, hoi cua
tu sach » thu sach, su sach, te sach
ma hoi » mai hoi, ma hoa, me hoi

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