Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu nghe » lieu nghe, hiem ngheo, nhiem nghe
nghe nam » nghe lam, nghiep nam, nghe nano
nam thuc » nam thuoc, am thuc, nam thu
vat hanh » vat thanh, van hanh, va hanh
nang ma » tang ma, sang ma, nang cao
sach ky » sach y, sach ty, sach kem
hanh ve » hanh vi, hanh va, hanh kem
cua tre » cua te, cuu tre, dua tren
sac ky » cac ky, sai ky
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach ky) or (sac ky)) nang ma hoi. hieu nghe nam thuc vat hanh ve ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sac ky)) nang ma hoi. hieu nghe nam thuc vat hanh ve ((cua tre) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) or (sac ky)) nang ma hoi. hieu nghe nam thuc vat hanh ve ((cua tre) or (cua triet))*.