Perhaps you should try some spelling variations:
thanh doi » thanh loi, thanh moi, thanh do
va tham » van tham, va cham, va thanh
doi cua » dai cua, hoi cua
thuc va » thuc vat, thuc dan, thuc day
hieu va » lieu va, hieu qua
sach ya » sach xa, sach ha, sach va
loc va » hoc va, luc va
cua te » cua tu
x hoi » xa hoi, o hoi, x ho

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 y) OR (sach ya)) nang x hoi. hieu va tham ((loc va) OR (thuc va)) thanh doi cua te~.
• Adding a wildcard symbol may retrieve word variants: te ((sach y) or (sach ya)) nang x hoi. hieu va tham ((loc va) or (thuc va)) thanh doi cua te*.