Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
hanh vai » hanh vi, hanh va, hanh tai
viec lam » viec va
vai cuu » vai cua
sach ky » sac ky, sach y, sach ty
tu sach » thu sach, su sach, te sach
xay hoi » xa hoi, cay phoi, gay thoi
tay hoi » tay ho, tao hoi, tay thai
ky dang » ky nang, ky danh
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.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky dang ((xay hoi) OR (tay hoi)). hieu viec lam ((lo van) or (le van)) hanh vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky dang ((xay hoi) OR (tay hoi)). hieu viec lam ((lo van) OR (le van)) hanh vai cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky dang ((xay hoi) OR (tay hoi)). hieu viec lam ((lo van) or (le van)) hanh vai cuu tre*".