Perhaps you should try some spelling variations:
hieu viec » nhieu viec, sieu viet, hieu hien
sach nuoc » sach duoc, cac nuoc, bach tuoc
hieu van » hieu va, thien van, lieu va
danh hoi » danh hoa, dan hoi, danh hoc
su sach » so sach, vu sach
hoi cua » hoi chuc
va danh » va dinh, va dan, va hanh
hieu ve » hieu va
sach ky » sac ky, sach y, sach ty
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
cua tre » cua te, cuu tre, cua triet

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky lang xa hoi. ((hieu viec) or (((hieu ve) OR (hieu van)))) sach nuoc va danh hoi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky lang xa hoi. ((hieu viec) OR (((hieu ve) OR (hieu van)))) sach nuoc va danh hoi cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky lang xa hoi. ((hieu viec) or (((hieu ve) OR (hieu van)))) sach nuoc va danh hoi cua tre*".