Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
thu nang » thi nang, thu hang, thu bang
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
cau tuc » cau truc, cau tu, cau luc
va tinh » may tinh
tinh di » tinh doi, trinh di, tinh da
cua tre » cua te, cuu tre, cua triet
tuc va » thuc va, truc va, tuc xa
di cua » dai cua, doi cua, de cua
x hoi » xa hoi, o hoi, x ho

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: su sach thu nang x hoi. ((hieu ve) OR (hieu qua)) cau tuc va tinh di cua tre~.
• Adding a wildcard symbol may retrieve word variants: su sach thu nang x hoi. ((hieu ve) or (hieu qua)) cau tuc va tinh di cua tre*.