Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
thu hang » thi hang, thuc hanh, thu huong
hieu van » hieu va, thien van, lieu va
cau thuc » cau truc, can thuc, cau phuc
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 thu hang co loi. hieu van ((cau thuc) OR (cuu thuc)) van hanh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach thu hang co loi. hieu van ((cau thuc) OR (cuu thuc)) van hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach thu hang co loi. hieu van ((cau thuc) OR (cuu thuc)) van hanh vi cua tre*.