Perhaps you should try some spelling variations:
viet cuu » viet suu, viet cau, viet chu
te sach » toc sach
cac duc » cac du, cao duc, cac dac
va tinh » may tinh
va dinh » van dinh, va kinh, vu dinh
cuu tre » cua tre, cau tren, cau treo
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
xang xa » mang xa, ang xa, dang xay
ve cac » va cac, vien cac

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 xa)) hoi. hieu ve cac duc ((va dinh) OR (va tinh)) viet cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty ((xang xa) OR (lang xa)) hoi. hieu ve cac duc ((va dinh) or (va tinh)) viet cuu tre~".
• Adding a wildcard symbol may retrieve word variants: te sach ty ((xang xa) OR (lang xa)) hoi. hieu ve cac duc ((va dinh) or (va tinh)) viet cuu tre*.