Perhaps you should try some spelling variations:
thanh lai » thanh hai, thanh lap, thanh loi
va thanh » gia thanh, ban thanh, va tinh
chau tre » chay tren, chau tho, cho tre
sach ty » sach tu, sach thu, xach tay
qua cau » quan cau, qua cac, qua ca
cau luc » cau truc, cau phuc
co hoi » co hoc
luc va » duc va, tuc va, loc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach ty) OR (sach y)) nang ((co loi) or (co hoi)). hieu qua cau luc va thanh lai chau tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ty) OR (sach y)) nang ((co loi) OR (co hoi)). hieu qua cau luc va thanh lai chau tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ty) OR (sach y)) nang ((co loi) or (co hoi)). hieu qua cau luc va thanh lai chau tre".
• Adding a wildcard symbol may retrieve word variants: su ((sach ty) OR (sach y)) nang ((co loi) or (co hoi)). hieu qua cau luc va thanh lai chau tre*.