Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
hieu va » lieu va, hieu qua
nong do » dong do, nang doc, dong dao
xa nong » xa dong, xuat nong, may nong
cac bac » cac bai, cac ban, cac cach
sach ky » sac ky, sach y, sach ty
tu sach » thu sach, su sach, te sach
lang xa » lang ha, dang xay, lang van
hieu ve » hieu van
ky lang » ky nang, ky dang, ky tang
cac tac » cac toc, cac dac, cac tai
do cua » doi cua, co cua, de cua

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: tu sach ky lang xa hoi. ((hieu ve) OR (hieu va)) ((cac tac) OR (cac bac)) xa nong do cua viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky lang xa hoi. ((hieu ve) OR (hieu va)) ((cac tac) or (cac bac)) xa nong do cua viet~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky lang xa hoi. ((hieu ve) OR (hieu va)) ((cac tac) or (cac bac)) xa nong do cua viet*.