Perhaps you should try some spelling variations:
sach nuoc » sach duoc, cac nuoc, bach tuoc
hieu viec » nhieu viec, sieu viet, hieu hien
dung doi » huong doi, dung tai, dung co
su sach » vu sach
hieu ve » hieu va, hieu van
doi cua » dai cua, hoi cua
va dung » van dung, va duong, vat dung
cua tre » cua te, cuu tre, cua triet
nang xa » nang x, lang xa, nang ma
so sach » so sanh, bo sach, co sach
y nang » ky nang, ly nang, v nang

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)) y nang xa hoi. ((hieu viec) or (hieu ve)) sach nuoc va dung doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) y nang xa hoi. ((hieu viec) OR (hieu ve)) sach nuoc va dung doi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (so sach)) y nang xa hoi. ((hieu viec) or (hieu ve)) sach nuoc va dung doi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (so sach)) y nang xa hoi. ((hieu viec) or (hieu ve)) sach nuoc va dung doi cua tre*.