Perhaps you should try some spelling variations:
doc sach » hoc sach, toc sach, nuoc sach
dang van » hoang van, hang va
tang van » hoang van, trong van, tang luan
van hanh » van thanh, ban hanh, van anh
hieu ve » hieu van
hieu va » lieu va, hieu qua
xuc van » duc van, luc van, vuc van
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: doc sach y ((dang van) or (tang van)) hoi. ((hieu ve) or (hieu va)) cam xuc van hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach y ((dang van) OR (tang van)) hoi. ((hieu ve) OR (hieu va)) cam xuc van hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: doc sach y ((dang van) or (tang van)) hoi. ((hieu ve) or (hieu va)) cam xuc van hanh vi cua tre*.