Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
viec cac » vien cac, viec cua, viec lam
vai cac » va cac, tai cac, voi cac
vai cau » va cau, van cau, lai chau
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
sach ky » sac ky, sach y, sach ty
so van » su van, vo van
lo van » le van, vo 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 nang xa hoi. hieu viec cac ((lo van) or (so van)) danh ((vai cau) OR (vai cac)) treo~.
• 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 (so van)) danh ((vai cau) OR (vai cac)) treo*.
• 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 (so van)) danh ((vai cau) OR (vai cac)) treo*".