Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
hieu va » lieu va, hieu qua
cau luc » cau truc, cau phuc
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: te sach y nang x hoi. ((hieu va) or (hieu van)) ((cau luc) or (cam xuc)) van hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang x hoi. ((hieu va) OR (hieu van)) ((cau luc) OR (cam xuc)) van hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach y nang x hoi. ((hieu va) or (hieu van)) ((cau luc) or (cam xuc)) van hanh vi cua tre*.