Perhaps you should try some spelling variations:
dieu hien » dieu khien, dieu kien, bieu hien
hieu hien » bieu hien, chieu chien, dieu khien
hanh vai » hanh vi, hanh va, hanh tai
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, dai truc, dao tuc
va hanh » van hanh, va thanh, va danh
vai cua » dai cua, hai cua, lai cua
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa
tuc va » thuc va, truc va, tuc xa

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) OR (dieu hien)) dai tuc va hanh vai cua viet~".
• Adding a wildcard symbol may retrieve word variants: so sach y nang ma hoi. ((hieu hien) OR (dieu hien)) dai tuc va hanh vai cua viet*.