Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
sach thu » sach thue, sach thieu, sach tham
thu nang » thi nang, thu hang, thu bang
hanh lai » hanh lam, hanh tai, thanh lap
lai cua » dai cua, hai cua, lai chau
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao
tuc va » thuc va, truc va, duc va
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach thu nang x hoi. lieu va cam ((tuc va) or (tuc xa)) hanh lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach thu nang x hoi. lieu va cam ((tuc va) OR (tuc xa)) hanh lai cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach thu nang x hoi. lieu va cam ((tuc va) or (tuc xa)) hanh lai cua tre*.