Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
va thanh » gia thanh, ban thanh, va tinh
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
va hanh » van hanh, va danh, ban hanh
cua tre » cua te, cuu tre, cua triet
te sai » te tai, te bai, te lai
sai ky » sac ky
cam tu » cam thu, nam tu, dam tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sai ky nang ma hoa. hieu ve ((nam thuc) or (cam tu)) ((va hanh) or (va thanh)) dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sai ky nang ma hoa. hieu ve ((nam thuc) OR (cam tu)) ((va hanh) OR (va thanh)) dai cua tre.
• Adding a wildcard symbol may retrieve word variants: te sai ky nang ma hoa. hieu ve ((nam thuc) or (cam tu)) ((va hanh) or (va thanh)) dai cua tre*.