Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
nam thuc » nam thuoc, am thuc, nam thu
hanh dai » hanh tai, hanh dao, vanh dai
ky sang » ky nang, ky dang, duy sang
ky tang » ky nang, ky dang, kho tang
hieu le » hieu he, hieu ly, tieu le
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
hieu ve » hieu va, hieu van
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 sang) OR (ky tang)) xa hoi. ((hieu le) or (hieu ve)) nam thuc va hanh dai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ((ky sang) OR (ky tang)) xa hoi. ((hieu le) OR (hieu ve)) nam thuc va hanh dai cua viet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ((ky sang) OR (ky tang)) xa hoi. ((hieu le) or (hieu ve)) nam thuc va hanh dai cua viet*".