Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
dang duc » dang quoc, dang su, anh duc
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
dao duc » giao duc, tao duoc
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
vi cua » vai cua, di cua
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: su sach y nang x hoi. hieu van ((dang duc) OR (dao duc)) van hanh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang x hoi. hieu van ((dang duc) OR (dao duc)) van hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach y nang x hoi. hieu van ((dang duc) OR (dao duc)) van hanh vi cua tre*.