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

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach y nang ma hoi. hieu hien ((dai tuc) OR (dai truc)) va hanh vi cua viet~".
• Adding a wildcard symbol may retrieve word variants: so sach y nang ma hoi. hieu hien ((dai tuc) OR (dai truc)) va hanh vi cua viet*.