Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
dinh du » dinh duc, dinh cu, dinh tu
va dinh » van dinh, va kinh, va tinh
sach ky » sac ky, sach y, sach ty
cuu tre » cua tre, cau tren, cau treo
nang xa » lang xa, nang ma, mang xa
luc va » duc va, tuc va, loc va
du cuu » tu cuu
va cam » va cham, va cao, va cai

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: hoc sach ky ((nang xa) OR (nang x)) hoi. hieu ((va cam) OR (va cac)) luc va dinh du cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ky ((nang xa) or (nang x)) hoi. hieu ((va cam) OR (va cac)) luc va dinh du cuu tre~".
• Adding a wildcard symbol may retrieve word variants: hoc sach ky ((nang xa) or (nang x)) hoi. hieu ((va cam) OR (va cac)) luc va dinh du cuu tre*.