Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
thu bang » thu ban, chu bang, thu trang
hanh lai » hanh lam, hanh tai, thanh lap
thu hang » thi hang, thuc hanh, thu huong
van hanh » van thanh, ban hanh, van anh
cao duc » dao duc, cao suc, giao duc
lai cua » dai cua, hai cua, lai chau
cac duc » cac du, cac dac, cac nuoc
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet

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

• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((thu bang) OR (thu hang)) xa hoi. hieu va ((cac duc) OR (cao duc)) van hanh lai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((thu bang) or (thu hang)) xa hoi. hieu va ((cac duc) OR (cao duc)) van hanh lai cua tre~".
• Adding a wildcard symbol may retrieve word variants: toc sach ((thu bang) or (thu hang)) xa hoi. hieu va ((cac duc) OR (cao duc)) van hanh lai cua tre*.