Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
viec cac » vien cac, viec cua, viec lam
dong vai » dong va, dong vat, dong hai
dong tai » dung tai, luong tai, cong tac
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 » cua tre, cau tren, cau treo
lo van » vo van, so van, do 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 cac ((lo van) OR (le van)) ((dong vai) OR (dong tai)) cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xa hoi. hieu viec cac ((lo van) OR (le van)) ((dong vai) or (dong tai)) cuu tre~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. hieu viec cac ((lo van) OR (le van)) ((dong vai) or (dong tai)) cuu tre*.