Perhaps you should try some spelling variations:
va thanh » ban thanh, va tinh, le thanh
nam thuc » nam thuoc, am thuc, nam thu
cua tre » cua te, cuu tre, cua triet
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
vi cua » vai cua, di cua
tu cai » tu cac, tu can, tu bai
cai ky » cao ky, cac ky, cam ky
ma hoi » xa hoi, ma hoa, me hoi
ve nam » he nam, va nam, le nam

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 cai ky nang ((ma hoi) OR (mai hoi)). hieu ve nam thuc ((va thanh) OR (gia thanh)) vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cai ky nang ((ma hoi) or (mai hoi)). hieu ve nam thuc ((va thanh) OR (gia thanh)) vi cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu cai ky nang ((ma hoi) or (mai hoi)). hieu ve nam thuc ((va thanh) OR (gia thanh)) vi cua tre*.