Perhaps you should try some spelling variations:
hanh lai » hanh lam, hanh tai, thanh lap
tang khu » tai khu, tang ha, tang thi
lang van » dang van, tang van, hoang van
cac duc » cac du, cao duc, cac dac
lai cua » dai cua, hai cua, lai chau
va hanh » van hanh, va thanh, va danh
hieu ve » hieu va, hieu van
tang ky » dang ky, trong ky
van hoi » van hoa, van hoc, van hoe
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: so ((tang ky) OR (tang khu)) lang van hoi. hieu ve ((cac duc) or (giao duc)) va hanh lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so ((tang ky) OR (tang khu)) lang van hoi. hieu ve ((cac duc) OR (giao duc)) va hanh lai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so ((tang ky) OR (tang khu)) lang van hoi. hieu ve ((cac duc) or (giao duc)) va hanh lai cua tre".
• Adding a wildcard symbol may retrieve word variants: so ((tang ky) OR (tang khu)) lang van hoi. hieu ve ((cac duc) or (giao duc)) va hanh lai cua tre*.