Perhaps you should try some spelling variations:
thanh doi » thanh loi, thanh moi, thanh do
thuc van » thuc vat, thuc va, thuc hanh
thuc dan » thuc hanh, hoc dan, thuc vat
te sach » toc sach
sach ty » sach y, sach tu, sach thu
ty mang » ty xang, ty hang, tin mang
mang xa » lang xa, mang may, dang xay
hieu va » lieu va, hieu qua
doi cua » dai cua, hoi cua
cua te » cua tu

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty mang xa hoi. hieu va cac ((thuc van) OR (thuc dan)) thanh doi cua te~".
• Adding a wildcard symbol may retrieve word variants: te sach ty mang xa hoi. hieu va cac ((thuc van) OR (thuc dan)) thanh doi cua te*.