Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
vu nang » vuc nang, va nang, vu dang
dao luc » dao duc, dao tuc, bao luc
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
v nang » va nang, van nang, voi nang
luc va » duc va, tuc va, loc va
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ((v nang) OR (vu nang)) co hoc. hieu van dao luc va hanh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((v nang) OR (vu nang)) co hoc. hieu van dao luc va hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ((v nang) OR (vu nang)) co hoc. hieu van dao luc va hanh vi cua tre*.