Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
doi cua » dai cua, hoi cua
xa nong » xa dong, xuat nong, may nong
xa nang » da nang, va nang, ca nang
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
ve cac » vien cac

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