Perhaps you should try some spelling variations:
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
doi cua » dai cua, hoi cua, dong cua
qua ca » qua cac, qua cua, qua cai
tuc va » thuc va, truc va, tuc xa
di cua » dai cua, de cua, do cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ky lang xa hoi. hieu qua ca ((tuc va) or (duc va)) hanh ((di cua) OR (doi cua)) viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky lang xa hoi. hieu qua ca ((tuc va) OR (duc va)) hanh ((di cua) OR (doi cua)) viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky lang xa hoi. hieu qua ca ((tuc va) or (duc va)) hanh ((di cua) OR (doi cua)) viet".
• Adding a wildcard symbol may retrieve word variants: so sach ky lang xa hoi. hieu qua ca ((tuc va) or (duc va)) hanh ((di cua) OR (doi cua)) viet*.