Perhaps you should try some spelling variations:
hanh lai » hanh lam, hanh tai, thanh lap
so tang » son tang, so trang, do tang
lai cua » dai cua, hai cua, lai chau
va hanh » van hanh, va thanh, va danh
cac duc » cac du, cao duc, cac dac
hieu ve » hieu va, hieu van
van hoi » van hoa, van hoc, van hoe
ky dang » ky nang, ky danh
ky lang » ky nang, ky tang, tay lang
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 lang) OR (ky dang)) 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 lang) OR (ky dang)) 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 lang) OR (ky dang)) 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 lang) OR (ky dang)) van hoi. hieu ve ((cac duc) or (giao duc)) va hanh lai cua tre*.