Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hoi lang » hoa lang
hanh vai » hanh vi, hanh va, hanh tai
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
hoi dan » hoa dan, hoc dan, hoi dap
cua tre » cua te, cuu tre, cua triet
ke cau » ket cau
va cau » van cau, va cac, va dau
x hoi » xa hoi, o hoi, x ho

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: thuat sach ((hoi lang) OR (hoi dan)) x hoi. hieu ((ke cau) OR (va cau)) duc va hanh vai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ((hoi lang) OR (hoi dan)) x hoi. hieu ((ke cau) or (va cau)) duc va hanh vai cua tre~".
• Adding a wildcard symbol may retrieve word variants: thuat sach ((hoi lang) OR (hoi dan)) x hoi. hieu ((ke cau) or (va cau)) duc va hanh vai cua tre*.