Perhaps you should try some spelling variations:
chieu chien » thien chien
hieu hien » bieu hien, dieu hien, dieu khien
cua viet » ca viet, hoa viet, cua vat
nang ma » tang ma, sang ma, nang cao
so sanh » do sanh
dai tuc » dai thuc, dai truc, dao tuc
va hanh » van hanh, va thanh, va danh
so sach » bo sach, co sach, hoc sach
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa
tuc va » thuc va, truc va, tuc xa
vi cua » vai cua, di cua

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (so sanh)) y nang ma hoi. ((hieu hien) OR (chieu chien)) dai tuc va hanh vi cua viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) OR (so sanh)) y nang ma hoi. ((hieu hien) or (chieu chien)) dai tuc va hanh vi cua viet~".
• Adding a wildcard symbol may retrieve word variants: ((so sach) OR (so sanh)) y nang ma hoi. ((hieu hien) or (chieu chien)) dai tuc va hanh vi cua viet*.