Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
cham duc » pham duc, cham soc, pham duy
van cham » van chat, van tham, va cham
hieu van » hieu va, thien van, lieu va
vu nang » vuc nang, va nang, vu dang
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
cua tre » cuu tre, cua triet, dua tren
v nang » va nang, van nang, voi nang
cua te » cua tu

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: toc sach ((v nang) OR (vu nang)) xa hoi. hieu van cham duc va danh vi ((cua tre) OR (cua te))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((v nang) or (vu nang)) xa hoi. hieu van cham duc va danh vi ((cua tre) OR (cua te))~".
• Adding a wildcard symbol may retrieve word variants: toc sach ((v nang) or (vu nang)) xa hoi. hieu van cham duc va danh vi ((cua tre) OR (cua te))*.