Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
tu sach » thu sach, su sach, te sach
hoi cua » hoi chuc
anh hoi » anh noi, anh hoc, anh khoa
cuc ban » cua ban, cac ban, cuu ban
qua cam » qua cham, qua cac, qua ca
nang xa » nang x, lang xa, nang ma
xuc ban » duc ban, quoc ban, xuat ban
cua tre » cua te, cuu tre, cua triet

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 ((nang xa) or (hang va)) hoi. hieu qua cam ((xuc ban) OR (cuc ban)) anh hoi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thu ((nang xa) OR (hang va)) hoi. hieu qua cam ((xuc ban) OR (cuc ban)) anh hoi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach thu ((nang xa) or (hang va)) hoi. hieu qua cam ((xuc ban) OR (cuc ban)) anh hoi cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach thu ((nang xa) or (hang va)) hoi. hieu qua cam ((xuc ban) OR (cuc ban)) anh hoi cua tre*.