Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
thuc van » thuc vat, thuc dan, thuc va
van cam » van nam, van lam, van cau
xuc van » duc van, xuc ban, chuc van
luc van » luoc van, luu van, duc 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: thu sach y nang x hoi. hieu van cam ((((xuc van) OR (thuc van))) or (luc van)) hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y nang x hoi. hieu van cam ((((xuc van) OR (thuc van))) OR (luc van)) hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y nang x hoi. hieu van cam ((((xuc van) OR (thuc van))) or (luc van)) hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach y nang x hoi. hieu van cam ((((xuc van) OR (thuc van))) or (luc van)) hanh vi cua tre*.