Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
sach nuoc » sach duoc, cac nuoc, bach tuoc
dung doi » huong doi, dung tai, dung co
hieu van » hieu va, thien van, lieu va
doi cua » dai cua, hoi cua
va dung » van dung, va duong, vat dung
lang xa » lang ha, dang xay, lang van
sach ky » sac ky, sach ty, sach kem
cua te » cua tu

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