Perhaps you should try some spelling variations:
sach nuoc » sach duoc, cac nuoc, bach tuoc
hieu viec » nhieu viec, hieu ve, sieu viet
hieu van » hieu va, thien van, lieu va
su sach » so sach
danh di » danh du, xanh di, danh dien
va danh » va dinh, va dan, va hanh
cua tre » cua te, cuu tre, cua triet
nang xa » nang x, lang xa, nang ma
vu sach » vu bach, vu khach
di cua » dai cua, doi cua, de cua

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 (vu sach)) ky nang xa hoi. ((hieu viec) or (hieu van)) sach nuoc va danh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) ky nang xa hoi. ((hieu viec) OR (hieu van)) sach nuoc va danh di cua tre.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu sach)) ky nang xa hoi. ((hieu viec) or (hieu van)) sach nuoc va danh di cua tre*.