Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
van hanh » van thanh, ban hanh, van anh
thu bang » thu ban, thu hang, thu trang
chu bang » chuc nang, chu quang, chu trang
cam luc » cam xuc, cau luc
va hanh » va thanh, va danh, ban hanh
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach ((thu bang) or (chu bang)) x hoi. lieu va cam luc ((va hanh) OR (van hanh)) dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ((thu bang) OR (chu bang)) x hoi. lieu va cam luc ((va hanh) OR (van hanh)) dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ((thu bang) or (chu bang)) x hoi. lieu va cam luc ((va hanh) OR (van hanh)) dai cua tre".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ((thu bang) or (chu bang)) x hoi. lieu va cam luc ((va hanh) OR (van hanh)) dai cua tre*.