Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
thuc dan » thuc hanh, hoc dan, thuc vat
hieu le » hieu ve, hieu he, hieu ly
thuc va » thuc vat, thuc day
tang ma » mang may, tang van
ky tang » ky nang, ky dang, kho tang
hanh di » hanh vi, hanh de, hang di
ma hoi » mai hoi, xa hoi, ma hoa
le nam » ly nam, he nam, le na
sac ky » cac ky, sai ky
di cua » dai cua, doi cua, de cua
su sac » su sach, su cac, su xac

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 tang ma hoi. hieu le nam ((thuc va) or (thuc dan)) hanh di cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky tang ma hoi. hieu le nam ((thuc va) OR (thuc dan)) hanh di cua viet*.