Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
doc sach » toc sach, nuoc sach, dac sac
mai khoi » mai khoa, tai khoa, dai khoa
va thanh » gia thanh, ban thanh, va tinh
cac khoi » cac thoi, cac khoan, cach thoi
hoc sach » hoc sinh, hoc cac, hoc anh
hieu ve » hieu va, hieu van
hai cua » thai cua, dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam
xuc va » duc va, tuc va, luc va

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) or (hoc sach)) ky nang ((mai khoi) OR (cac khoi)). hieu ve cam xuc va thanh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc sach) OR (hoc sach)) ky nang ((mai khoi) OR (cac khoi)). hieu ve cam xuc va thanh hai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doc sach) or (hoc sach)) ky nang ((mai khoi) OR (cac khoi)). hieu ve cam xuc va thanh hai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((doc sach) or (hoc sach)) ky nang ((mai khoi) OR (cac khoi)). hieu ve cam xuc va thanh hai cua tre*.