Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
co sach » bo sach, cuon sach
nang ma » tang ma, sang ma, nang cao
hieu ly » hieu ky, lieu ly, dieu ly
lieu ky » hieu ky, dieu ky, lieu xay
va hanh » van hanh, va thanh, va danh
cuu tre » cua tre, cau tren, cau treo
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa
vi cuu » vi luu, vinh cuu
nuoc » quoc, duoc, ngoc

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 (hoc sach)) y nang ma hoi. ((hieu ly) OR (lieu ky)) dat nuoc va hanh vi cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((co sach) OR (hoc sach)) y nang ma hoi. ((hieu ly) or (lieu ky)) dat nuoc va hanh vi cuu tre~".
• Adding a wildcard symbol may retrieve word variants: ((co sach) OR (hoc sach)) y nang ma hoi. ((hieu ly) or (lieu ky)) dat nuoc va hanh vi cuu tre*.