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