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

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