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 hanh
su sach » so sach, vu sach
hanh ve » hanh vi, hanh va, hanh kem
hanh de » hanh kem
thuc va » thuc vat, thuc dan, thuc day
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
nang o » nang co, nang ho, nang ro
ve am » va am
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 van nang o hoi. hieu ve am ((thuc van) OR (thuc va)) ((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) OR (thuc va)) ((hanh de) OR (hanh ve)) cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach van nang o hoi. hieu ve am ((thuc van) OR (thuc va)) ((hanh de) or (hanh ve)) cua tre*".