Perhaps you should try some spelling variations:
te sach » toc sach
tinh va » tich va, trinh van, trinh vat
va tinh » may tinh
hieu ve » hieu va, hieu van
dai hoi » dai hoc, dai hai, dai moi
mai hoi » mai khoi, lai hoi, mai doi
so sach » so sanh, bo sach, co sach
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam
xuc va » duc va, tuc va, luc va
va cua » va chua, via cua, ca cua

You may be able to get more results by adjusting your search query.

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