Perhaps you should try some spelling variations:
thuc dan » thuc hanh, hoc dan, thuc vat
thuc ban » thuoc ban, thu ban, thuc van
te sach » toc sach
sach ty » sach y, sach tu, sach thu
hieu va » lieu va, hieu qua
xang xa » lang xa, mang xa, ang xa
lang ha » long ha
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

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

• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty ((xang xa) OR (lang ha)) hoi. hieu va cac ((thuc ban) OR (thuc dan)) hanh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty ((xang xa) or (lang ha)) hoi. hieu va cac ((thuc ban) OR (thuc dan)) hanh vi cua tre~".
• Adding a wildcard symbol may retrieve word variants: te sach ty ((xang xa) or (lang ha)) hoi. hieu va cac ((thuc ban) OR (thuc dan)) hanh vi cua tre*.