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

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