Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
thuc day » thuc vat
thuc dan » thuc hanh, hoc dan, thuc vat
hang di » hang doi, hang dien, hang dich
nang ma » tang ma, sang ma, nang cao
hieu ly » hieu ky, lieu ly, dieu ly
hang vi » hang va, hanh vi, khang voi
su sac » su sach, su cac, su xac
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 sac ky nang ma hoi. hieu ly nam ((thuc day) or (thuc dan)) ((hang di) or (hang vi)) cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky nang ma hoi. hieu ly nam ((thuc day) OR (thuc dan)) ((hang di) OR (hang vi)) cua viet.
• Adding a wildcard symbol may retrieve word variants: su sac ky nang ma hoi. hieu ly nam ((thuc day) or (thuc dan)) ((hang di) or (hang vi)) cua viet*.