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