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

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) OR (da nang)) doi cua viet~.
• 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) OR (da nang)) doi cua viet~".
• Adding a wildcard symbol may retrieve word variants: su sach tay lang xa hoi. ((hieu ve) or (hieu va)) cac tuc ((xa nang) OR (da nang)) doi cua viet*.