Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
hieu van » hieu va, thien van, lieu va
xuc van » duc van, luc van, xuc ban
hieu ve » hieu va
cua tre » cua te, cuu tre, cua triet
van hoi » van hoa, van hoc, van hoe
y lang » _ lang, tay lang, yen lang
o lang » hoa lang, hoi 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 (o lang)) van hoi. ((hieu ve) or (hieu van)) 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 (o lang)) van hoi. ((hieu ve) OR (hieu van)) cam xuc van hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((y lang) OR (o lang)) van hoi. ((hieu ve) or (hieu van)) cam xuc van hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: toc sach ((y lang) OR (o lang)) van hoi. ((hieu ve) or (hieu van)) cam xuc van hanh vi cua tre*.