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 xa » nang x, nang ma, mang xa
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
tu bai » tu ban, tu bat, te bai
bai ky » ban ky, sai ky, bac ky

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu bai ky ((nang xa) OR (lang xa)) hoi. hieu ve ((cam thuc) or (am thuc)) va thanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu bai ky ((nang xa) OR (lang xa)) 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 bai ky ((nang xa) OR (lang xa)) hoi. hieu ve ((cam thuc) or (am thuc)) va thanh vai cua tre*".