Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
thuc day » thuc dan, thuc vat
ky sang » ky nang, ky dang, ky tang
sang xa » song xa, lang xa, sang ma
hieu le » hieu he, hieu ly, tieu le
hanh di » hanh vi, hanh de, hang di
hieu ve » hieu va, hieu van
thuc va » thuc vat, thuc dan
di cua » dai cua, doi cua, de cua
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky

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 xa hoi. ((hieu le) or (hieu ve)) nam ((thuc va) OR (thuc day)) hanh di cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky sang xa hoi. ((hieu le) OR (hieu ve)) nam ((thuc va) OR (thuc day)) hanh di cua viet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky sang xa hoi. ((hieu le) or (hieu ve)) nam ((thuc va) OR (thuc day)) hanh di cua viet*".