Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
thu nang » thi nang, thu hang, thu bang
hieu san » hieu van, hieu sau, chieu sang
ban hanh » ban hang
co sach » bo sach, cuon sach, hoc sach
duc ban » duc tan, duc van, dua ban
lai cua » hai cua, lai chau, thai cua
x hoi » o hoi, x ho, 5 hoi
pham » phan

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

• Performing a fuzzy search may retrieve terms with similar spellings: co sach thu nang ((x hoi) or (xa hoi)). hieu san pham duc ban hanh ((lai cua) or (dai cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: co sach thu nang ((x hoi) OR (xa hoi)). hieu san pham duc ban hanh ((lai cua) OR (dai cua)) triet.
• Adding a wildcard symbol may retrieve word variants: co sach thu nang ((x hoi) or (xa hoi)). hieu san pham duc ban hanh ((lai cua) or (dai cua)) triet*.