Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
thu bang » thu ban, thu hang, chu bang
tu sach » thu sach, su sach, te sach
can ban » van ban, toan ban
cac ban » cac dan, cac van, cac bai
cuc ban » cua ban, cuu ban, duc ban
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao
bang x » nang x, bang _, bang 2
danh d » danh di, danh du, anh d
x hoi » xa hoi, o hoi, x ho
d cua » de cua, do cua, da cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach thu bang x hoi. hieu va cam ((cuc ban) or (((cac ban) OR (can ban)))) danh d cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thu bang x hoi. hieu va cam ((cuc ban) OR (((cac ban) OR (can ban)))) danh d cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach thu bang x hoi. hieu va cam ((cuc ban) or (((cac ban) OR (can ban)))) danh d cua tre*".