Perhaps you should try some spelling variations:
thien van » thi van
doc sach » hoc sach, toc sach, nuoc sach
dang van » hoang van, hang va
van hoi » van hoa, van hoc, van hoe
hieu ve » hieu va, hieu van
xuc van » duc van, luc van, vuc van
xuc ban » duc ban, cuc ban, quoc ban
cua tre » cua te, cuu tre, cua triet
y dang » ky dang, 2 dang, _ dang
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: doc sach y dang van hoi. ((hieu ve) or (thien van)) cam ((xuc van) OR (xuc ban)) hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach y dang van hoi. ((hieu ve) OR (thien van)) cam ((xuc van) OR (xuc ban)) hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc sach y dang van hoi. ((hieu ve) or (thien van)) cam ((xuc van) OR (xuc ban)) hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: doc sach y dang van hoi. ((hieu ve) or (thien van)) cam ((xuc van) OR (xuc ban)) hanh vi cua tre*.