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
dung doi » huong doi, dung tai, dung co
su sach » so sach, vu sach
doi cuu » doi cua, doi cuoc
va dung » van dung, va duong, vat dung
cuu tre » cua tre, cau tren, cau treo
sach ky » sac ky, sach y, sach ty
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa

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