Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
tay lang » tay tang, tay quang, tham lang
van hanh » van thanh, ban hanh, van anh
tai lang » tai cong, thi lan, tai san
hieu van » hieu va, thien van, lieu va
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va
van hoi » van hoa, van hoc, van hoe
cam tu » cam thu, nam tu, dam tu
tu van » tu va
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 ((tay lang) or (tai lang)) van hoi. ((hieu ve) or (hieu van)) cam tu van hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((tay lang) OR (tai lang)) van hoi. ((hieu ve) OR (hieu van)) cam tu van hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ((tay lang) or (tai lang)) van hoi. ((hieu ve) or (hieu van)) cam tu van hanh vi cua tre*.