Perhaps you should try some spelling variations:
sach thi » sach thu, sach tai, sach thieu
thi hang » thi hanh, thi nang, thi hong
hieu van » hieu va, thien van, lieu va
can thuc » dan thuc, van thuc, cay thuc
cuu thuc » cuu tac
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
hang co » hang cho, hang ca, nang co
cua tre » cua te, cuu tre, cua triet
co loi » co hoi
vi cua » vai cua, di cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te sach thi hang co loi. hieu van ((can thuc) or (cuu thuc)) van hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach thi hang co loi. hieu van ((can thuc) OR (cuu thuc)) van hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach thi hang co loi. hieu van ((can thuc) or (cuu thuc)) van hanh vi cua tre*.