Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
so sach » so sanh, bo sach, co sach
ky lang » ky nang, ky dang, tay lang
ky tang » ky nang, ky dang, kho tang
hanh di » hanh vi, hanh de, hang di
ha hoi » hoa hoi, ha noi, xa hoi
qua ca » qua cac, qua cua, qua cai
tuc va » thuc va, truc va, tuc xa
di cua » dai cua, doi cua, de 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) OR (ky tang)) ha hoi. hieu qua ca ((tuc va) or (duc va)) hanh di cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((ky lang) OR (ky tang)) ha hoi. hieu qua ca ((tuc va) OR (duc va)) hanh di cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ((ky lang) OR (ky tang)) ha hoi. hieu qua ca ((tuc va) or (duc va)) hanh di cua viet".
• Adding a wildcard symbol may retrieve word variants: so sach ((ky lang) OR (ky tang)) ha hoi. hieu qua ca ((tuc va) or (duc va)) hanh di cua viet*.