Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
viec cac » vien cac, viec cua, viec lam
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
lang ha » long ha
cua tre » cuu tre, cua triet, dua tren
ha hoi » hoa hoi, ha noi, xa hoi
lo van » vo van, so van, do van
cua te » cua tu

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 lang ha hoi. hieu viec cac ((lo van) or (le van)) doanh tai ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky lang ha hoi. hieu viec cac ((lo van) OR (le van)) doanh tai ((cua tre) OR (cua te))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky lang ha hoi. hieu viec cac ((lo van) or (le van)) doanh tai ((cua tre) OR (cua te))*".