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

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach ((thu bang) or (thu hang)) xa hoi. hieu va cac duc xanh hanh lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ((thu bang) OR (thu hang)) xa hoi. hieu va cac duc xanh hanh lai cua tre.
• Adding a wildcard symbol may retrieve word variants: hoc sach ((thu bang) or (thu hang)) xa hoi. hieu va cac duc xanh hanh lai cua tre*.