Perhaps you should try some spelling variations:
day thanh » dao thanh, dat thanh, da thanh
thanh ve » hanh ve, thanh va, thanh vien
thuc day » thuc dan, thuc vat
cua tre » cua te, cuu tre, cua triet
mai hoi » mai khoi, dai hoi, lai hoi
ky sang » ky nang, ky dang, ky tang
hieu ve » hieu va, hieu van
ve cua » le cua, de cua, te cua
tu cai » tu cac, tu can, tu cay
ma hoi » xa hoi, ma hoa, me hoi
tu bai » tu ban, tu bat, te bai
ve am » va 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 cai) OR (tu bai)) ky sang ((ma hoi) OR (mai hoi)). hieu ve am thuc day thanh ve cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cai) or (tu bai)) ky sang ((ma hoi) OR (mai hoi)). hieu ve am thuc day thanh ve cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((tu cai) or (tu bai)) ky sang ((ma hoi) OR (mai hoi)). hieu ve am thuc day thanh ve cua tre*.