Perhaps you should try some spelling variations:
thien van » thi van
hieu van » hieu va, lieu va, hieu ve
cac thuc » cach thuc, cac thu, can thuc
dinh vi » dinh ve, dinh viet, dinh tri
va dinh » van dinh, va kinh, va tinh
thuc va » thuc vat, thuc dan, thuc day
su sach » so sach, vu sach
nang ma » tang ma, sang ma, nang cao
so sanh » do sanh
cua tre » cua te, cuu tre, cua triet
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: ((su sach) OR (so sanh)) y nang ma hoi. ((hieu van) OR (thien van)) cac thuc va dinh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (so sanh)) y nang ma hoi. ((hieu van) OR (thien van)) cac thuc va dinh vi cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sanh)) y nang ma hoi. ((hieu van) OR (thien van)) cac thuc va dinh vi cua tre*.