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

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)). hieu le nam thuc ((va thanh) OR (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)). hieu le nam thuc ((va thanh) OR (ban thanh)) de cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu cao ky nang ((ma hoi) or (mai hoi)). hieu le nam thuc ((va thanh) OR (ban thanh)) de cua tre*.