Perhaps you should try some spelling variations:
va trong » va truong, va thong, va tuong
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
cam tuc » cam xuc, cam tu, nam thuc
cua tre » cuu tre, cua triet, dua tren
va cam » va cham, va cac, va cao
tuc va » thuc va, truc va, tuc xa
cua te » cua tu
o hoi » co hoi, o hoc, o hai

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 nang ((x ho) or (o hoi)). hieu va cam tuc va trong doi ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky nang ((x ho) OR (o hoi)). hieu va cam tuc va trong doi ((cua tre) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: so sach ky nang ((x ho) or (o hoi)). hieu va cam tuc va trong doi ((cua tre) or (cua te))*.