Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
va nang » van nang, da nang, cam nang
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
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 » vu 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 (va nang)) xa hoi. hieu ve pham duc va danh vi ((cua tre) OR (cua te))~.
• Adding a wildcard symbol may retrieve word variants: toc sach ((v nang) or (va nang)) xa hoi. hieu ve pham duc va danh vi ((cua tre) or (cua te))*.