Perhaps you should try some spelling variations:
co sach » bo sach, cuon sach, hoc sach
danh vi » hanh vi, dinh vi, danh di
va danh » va dinh, va dan, va hanh
cuu tre » cua tre, cau tren, cau treo
nang xa » lang xa, nang ma, mang xa
ly mat » ly may
vi cuu » vi luu, vinh cuu
ly dat » ly dai, ly dao, ly da

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 y ((nang xa) OR (nang x)) hoi. hieu ((ly dat) OR (ly mat)) nuoc va danh vi cuu tre~.
• Adding a wildcard symbol may retrieve word variants: co sach y ((nang xa) or (nang x)) hoi. hieu ((ly dat) or (ly mat)) nuoc va danh vi cuu tre*.