Perhaps you should try some spelling variations:
nang mai » nang ma, nang tai, lang mai
mai khoi » mai khoa, tai khoa, cac khoi
nam thuc » nam thuoc, am thuc, nam thu
cua viet » ca viet, cua vat, cua dieu
hieu ve » hieu va, hieu van
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
su sac » su sach, su cac, su xac
sac ky » cac ky, sai 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: su sac ky nang mai khoi. hieu ve ((nam thuc) or (cam tu)) va danh vi ((cua viet) or (hoa viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky nang mai khoi. hieu ve ((nam thuc) OR (cam tu)) va danh vi ((cua viet) OR (hoa viet)).
• Adding a wildcard symbol may retrieve word variants: su sac ky nang mai khoi. hieu ve ((nam thuc) or (cam tu)) va danh vi ((cua viet) or (hoa viet))*.