Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
bo sach » co sach, hoc sach
va hanh » van hanh, va thanh, va danh
cau tuc » cau truc, cau tu, cau luc
van cau » van dau, van hau, van chat
cua tre » cua te, cuu tre, cua triet
nang ma » tang ma, sang ma, nang cao
lang xa » lang ha, dang xay, lang van
nang xa » nang x, mang xa, ang xa
tuc va » thuc va, truc va, tuc xa
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 cau tuc 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 cau tuc va hanh vi cua tre*.