Perhaps you should try some spelling variations:
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, nang cao, mang may
sang ma » tang ma, sang tao, mang may
qua cam » qua cham, qua cac, qua ca
thuc va » thuc vat, thuc dan, thuc day
lua tre » cua tre, luy tre, dua tren
vi lua » vi luu

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: so sach ky ((nang ma) OR (sang ma)) hoi. hieu qua cam ((tuc xa) OR (thuc va)) hanh vi lua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky ((nang ma) OR (sang ma)) hoi. hieu qua cam ((tuc xa) or (thuc va)) hanh vi lua tre~".
• Adding a wildcard symbol may retrieve word variants: so sach ky ((nang ma) OR (sang ma)) hoi. hieu qua cam ((tuc xa) or (thuc va)) hanh vi lua tre*.