Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
sach ty » sach y, sach tu, xach tay
qua cac » cua cac
cac xuc » cam xuc, cac nuoc, chat xuc
va danh » va dinh, va dan, va hanh
cho cuu » cho chu, cho cu, cho cua
cuu tre » cua tre, cau tren, cau treo
co hoi » co loi
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: thu ((sach ty) or (sach thu)) nang ((co hoi) OR (co hoc)). hieu qua cac xuc va danh cho cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ty) OR (sach thu)) nang ((co hoi) OR (co hoc)). hieu qua cac xuc va danh cho cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach ty) or (sach thu)) nang ((co hoi) OR (co hoc)). hieu qua cac xuc va danh cho cuu tre".
• Adding a wildcard symbol may retrieve word variants: thu ((sach ty) or (sach thu)) nang ((co hoi) OR (co hoc)). hieu qua cac xuc va danh cho cuu tre*.