Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
te sach » toc sach
hieu va » lieu va, hieu qua
xuc van » duc van, luc van, xuc ban
vuc van » duc van, luc van, thuc van
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 van) or (hieu va)) cam ((xuc van) OR (vuc 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 van) OR (hieu va)) cam ((xuc van) OR (vuc van)) hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang x hoi. ((hieu van) or (hieu va)) cam ((xuc van) OR (vuc van)) hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach y nang x hoi. ((hieu van) or (hieu va)) cam ((xuc van) OR (vuc van)) hanh vi cua tre*.