Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
sach nuoc » sach duoc, cac nuoc, bach tuoc
danh dai » danh dau, danh di, danh sai
hieu van » hieu va, thien van, lieu va
va danh » va dinh, va dan, va hanh
su sach » vu sach
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
so sach » so sanh, bo sach, co sach
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) or (so sach)) ky lang xa hoi. ((hieu viec) or (hieu van)) sach nuoc va danh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) ky lang xa hoi. ((hieu viec) OR (hieu van)) sach nuoc va danh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sach)) ky lang xa hoi. ((hieu viec) or (hieu van)) sach nuoc va danh dai cua tre*.