Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
sach thu » sach thue, sach thieu, sach tham
thu xang » thu hang, thu bang, thu dang
so sach » so sanh, bo sach, co sach
cao hoc » co hoc, cho hoc, chat hoc
qua cam » qua cham, qua cac, qua ca
cua tre » cua te, cuu tre, cua triet
co hoi » co hoc, co loi
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach thu xang ((cao hoc) or (co hoi)). hieu qua cam xuc ((van ban) or (van thanh)) di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach thu xang ((cao hoc) OR (co hoi)). hieu qua cam xuc ((van ban) OR (van thanh)) di cua tre.
• Adding a wildcard symbol may retrieve word variants: so sach thu xang ((cao hoc) or (co hoi)). hieu qua cam xuc ((van ban) or (van thanh)) di cua tre*.