Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
bo sach » co sach, hoc sach
nang xa » nang x, mang xa, ang xa
lang xa » lang ha, dang xay, lang van
nang ma » tang ma, sang ma, nang cao
van cac » van hac, van cau, van bac
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
cac tu » cac thu, cach tu, cac du
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: bo sach y ((((nang xa) OR (lang xa))) OR (nang ma)) hoi. hieu van cac tu va hanh vi cua tre~.
• Adding a wildcard symbol may retrieve word variants: bo sach y ((((nang xa) or (lang xa))) or (nang ma)) hoi. hieu van cac tu va hanh vi cua tre*.