Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
mai khoi » mai khoa, tai khoa, cac khoi
thuc ban » thuoc ban, thuc dan, thu ban
thanh de » hanh de, thanh ve, thanh do
mai hoi » dai hoi, lai hoi, mai doi
hieu he » hieu ve, hiem he, hieu le
cua tre » cua te, cuu tre, cua triet
tu cao » cu cao, tu cac, vu cao
ma hoi » xa hoi, ma hoa, me hoi
de cua » le cua, te cua, dieu cua
he am » he nam, ve am

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: tu cao ky nang ((ma hoi) OR (((mai hoi) OR (mai khoi)))). hieu he am thuc ban thanh de cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cao ky nang ((ma hoi) or (((mai hoi) OR (mai khoi)))). hieu he am thuc ban thanh de cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu cao ky nang ((ma hoi) or (((mai hoi) OR (mai khoi)))). hieu he am thuc ban thanh de cua tre*.