Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
thu bang » thu hang, chu bang, thu trang
te sach » toc sach
cac dac » cac dan, cac dai, cac bac
hanh di » hanh vi, hanh de, hang di
thu ban » thu hang
hieu ve » hieu va, hieu van
cac duc » cac du, cao duc, cac nuoc
di cua » dai cua, doi cua, de cua
cua cu » cua chu, cua cau, cua su

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