Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
dang van » hoang van, hang va
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
cham cuu » cap cuu, chat cua
ban hanh » ban hang
lang xa » lang ha, dang xay, lang van
cuu ban » cuu van, cua ban, cuu san
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach y ((lang xa) or (dang van)) hoi. hieu van cham cuu ban hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y ((lang xa) OR (dang van)) hoi. hieu van cham cuu ban hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach y ((lang xa) or (dang van)) hoi. hieu van cham cuu ban hanh vi cua tre*.