Perhaps you should try some spelling variations:
nhieu viec » nhien viet
hieu viec » hieu ve, sieu viet, hieu hien
dong vai » dong tai, dong va, dong vat
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
cuu tre » cau tren, cau treo
cua tre » cua te, cua triet, dua tren
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 (nhieu viec)) cac lo van dong 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 (nhieu viec)) cac lo van dong vai ((cuu tre) OR (cua tre))~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. ((hieu viec) or (nhieu viec)) cac lo van dong vai ((cuu tre) OR (cua tre))*.