Perhaps you should try some spelling variations:
sach tay » xach tay, sach hay, sach nay
tay lang » tai lang, tay tang, tay quang
nang doi » nang doc, nang noi, hang doi
cua viet » ca viet, hoa viet, cua dieu
su sach » so sach, vu sach
lang xa » lang ha, dang xay, lang van
hieu ve » hieu van
hieu va » lieu va, hieu qua
cac tuc » cac toc, cac tu, cac tac
xa nang » da nang, va nang, xa nong

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

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