Perhaps you should try some spelling variations:
sach ky » sac ky, sach ty, sach kem
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
co xuoc » co duoc, co nuoc, co xuong
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
su viet » so viet
va co » vo co
ve su » va su

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) OR (sach y)) lang xa hoi. hieu va co xuoc ((va hanh) OR (va danh)) ve su viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) OR (sach y)) lang xa hoi. hieu va co xuoc ((va hanh) or (va danh)) ve su viet~".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) OR (sach y)) lang xa hoi. hieu va co xuoc ((va hanh) or (va danh)) ve su viet*.