Perhaps you should try some spelling variations:
cam truc » cau truc, nam truc, lam truoc
sach han » sach tham, sach danh, sach nang
han nang » phan nang, van nang, ban nang
hanh ve » hanh vi, hanh va, hanh kem
hanh de » hanh kem
truc va » thuc va, thuc vat, trung va
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao
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.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach han nang o hoi. hieu va cam truc va ((hanh de) or (hanh ve)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach han nang o hoi. hieu va cam truc va ((hanh de) OR (hanh ve)) cua tre*.