Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
hanh lam » thanh lap, hanh kem, hanh va
hanh lai » hanh tai, thanh lap, thanh loi
cua viet » ca viet, hoa viet, cua vat
van cam » van nam, van lam, van cau
cam luc » cam xuc, cau luc
cua tre » cua te, cuu tre, cua triet
luc va » duc va, tuc va, loc va
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach v nang x hoi. hieu van cam luc va ((hanh lai) or (hanh lam)) ((cua tre) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach v nang x hoi. hieu van cam luc va ((hanh lai) OR (hanh lam)) ((cua tre) OR (cua viet)).
• Adding a wildcard symbol may retrieve word variants: toc sach v nang x hoi. hieu van cam luc va ((hanh lai) or (hanh lam)) ((cua tre) or (cua viet))*.