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
danh vi » hanh vi, dinh vi, danh di
va danh » va dinh, va dan, va hanh
truc va » thuc va, thuc vat, trung va
so sanh » do sanh
nang ma » tang ma, sang ma, nang cao
ly nang » ky nang, ly hang, ly vang
bo sach » co sach, hoc sach
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 sanh) OR (bo sach)) ly nang ma hoa. ((hieu hien) OR (dieu hien)) dai truc va danh vi cua vat~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sanh) or (bo sach)) ly nang ma hoa. ((hieu hien) OR (dieu hien)) dai truc va danh vi cua vat~".
• Adding a wildcard symbol may retrieve word variants: ((so sanh) or (bo sach)) ly nang ma hoa. ((hieu hien) OR (dieu hien)) dai truc va danh vi cua vat*.