Perhaps you should try some spelling variations:
hieu viec » nhieu viec, sieu viet, hieu hien
van hanh » van thanh, ban hanh, van anh
hanh vai » hanh vi, hanh va, hanh tai
tu sach » thu sach, su sach, te sach
cuu tre » cau tren, cau treo
cua tre » cua te, cua triet, dua tren
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
cac lo » cac lop, cac co, cac bo
lo van » le van, vo van, so van

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: tu sach ky nang xa hoi. ((hieu viec) OR (hieu ve)) cac lo van hanh vai ((cuu tre) OR (cua tre))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xa hoi. ((hieu viec) or (hieu ve)) cac lo van hanh vai ((cuu tre) OR (cua tre))~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. ((hieu viec) or (hieu ve)) cac lo van hanh vai ((cuu tre) OR (cua tre))*.