Perhaps you should try some spelling variations:
sach van » sach han, sach va, bach van
van nang » van quang, van ban, van dong
thuc van » thuc vat, thuc dan, thuc va
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
hanh de » hanh kem
hanh ve » hanh vi, hanh va, hanh kem
cua tre » cua te, cuu tre, cua triet
nang o » nang co, nang ho, nang ro
o hoi » co hoi, o hoc, o hai
ve am » va am

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 van nang o hoi. hieu ve am thuc van ((hanh de) or (hanh ve)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach van nang o hoi. hieu ve am thuc van ((hanh de) OR (hanh ve)) cua tre*.