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
vanh dai » van dai, vanh tai, lanh dao
vu sach » vu bach, su sach, vu khach
so sanh » do sanh
va vanh » va van, va danh, va hanh
cua tre » cua te, cuu tre, cua triet
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu sach) or (so sanh)) ky nang x hoi. ((hieu viec) or (hieu van)) sach nuoc va vanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (so sanh)) ky nang x hoi. ((hieu viec) OR (hieu van)) sach nuoc va vanh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (so sanh)) ky nang x hoi. ((hieu viec) or (hieu van)) sach nuoc va vanh dai cua tre*.