Perhaps you should try some spelling variations:
sach tham » sach nha
tham nang » nham nang, tham lang, tham nhung
thuc van » thuc vat, thuc dan, thuc hanh
te sach » toc sach
hanh de » hanh ve, hanh kem
hanh di » hanh vi, hang di, danh di
thuc va » thuc vat, thuc dan, thuc day
cua tre » cua te, cuu tre, cua triet
qua ca » qua cac, qua cua, qua cai
nang o » nang co, nang ho, nang ro
o hoi » co hoi, o hoc, o hai

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 tham nang o hoi. hieu qua ca ((thuc van) OR (thuc va)) ((hanh di) OR (hanh de)) cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach tham nang o hoi. hieu qua ca ((thuc van) or (thuc va)) ((hanh di) OR (hanh de)) cua tre~".
• Adding a wildcard symbol may retrieve word variants: te sach tham nang o hoi. hieu qua ca ((thuc van) or (thuc va)) ((hanh di) OR (hanh de)) cua tre*.