Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
cam thuc » nam thuc, cam thu, can thuc
va thanh » gia thanh, ban thanh, va tinh
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
cai ky » cao ky, cam ky, sai ky
ma hoi » mai hoi, xa hoi, ma hoa

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