Perhaps you should try some spelling variations:
dieu hien » dieu khien, dieu kien, bieu hien
hieu hien » bieu hien, chieu chien, dieu khien
dai truc » dai thuc, doan truc, dai trung
cua viet » ca viet, hoa viet, cua vat
dai tuc » dai thuc, dao tuc, dai tu
nang ma » tang ma, sang ma, nang cao
va hanh » van hanh, va thanh, va danh
so sach » so sanh, bo sach, co sach
ma hoi » mai hoi, xa hoi, ma hoa
y nang » ky nang, ly nang, v nang
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 y nang ma hoi. ((hieu hien) OR (dieu hien)) ((dai tuc) OR (dai truc)) va hanh vi cua viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach y nang ma hoi. ((hieu hien) OR (dieu 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) OR (dieu hien)) ((dai tuc) or (dai truc)) va hanh vi cua viet*.