Perhaps you should try some spelling variations:
thuc dan » thuc hanh, hoc dan, thuc vat
cua viet » ca viet, hoa viet, cua dieu
thuc va » thuc vat, thuc day
ky tang » ky nang, ky dang, kho tang
tang ma » mang may, tang van
hieu le » hieu ve, hieu he, hieu ly
hanh di » hanh vi, hanh de, hang di
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky
le nam » ly nam, he nam, le na
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 tang ma hoi. hieu le nam ((thuc va) or (thuc dan)) hanh di ((cua viet) OR (cua vat))~.
• 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) OR (cua vat))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky tang ma hoi. hieu le nam ((thuc va) or (thuc dan)) hanh di ((cua viet) OR (cua vat))*".