Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
thanh vai » thanh hai, thanh van, thanh oai
cam thuc » nam thuc, cam thu, can thuc
cua tre » cua te, cuu tre, cua triet
ky sang » ky nang, ky dang, ky tang
sang xa » song xa, lang xa, sang ma
hieu ve » hieu va, hieu van
tu cai » tu cac, tu can, tu bai
cai ky » cao ky, cac ky, cam ky

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 sang xa hoi. hieu ve ((cam thuc) OR (am thuc)) va ((thanh vai) OR (thanh tai)) cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cai ky sang xa hoi. hieu ve ((cam thuc) or (am thuc)) va ((thanh vai) OR (thanh tai)) cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu cai ky sang xa hoi. hieu ve ((cam thuc) or (am thuc)) va ((thanh vai) OR (thanh tai)) cua tre*.