Perhaps you should try some spelling variations:
sach tren » sach tien, sach tranh
hieu van » hieu va, thien van, lieu va
sach tri » sach tai, sach truc, sach bai
hanh di » hanh vi, hanh de, hang di
cuc ban » cac ban, cuu ban, duc ban
van lam » van nam
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
di cua » dai cua, doi cua, de cua

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: tu ((sach tri) OR (sach tren)) nang xa hoi. hieu van lam ((cuc ban) OR (cua ban)) hanh di cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach tri) OR (sach tren)) nang xa hoi. hieu van lam ((cuc ban) or (cua ban)) hanh di cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu ((sach tri) OR (sach tren)) nang xa hoi. hieu van lam ((cuc ban) or (cua ban)) hanh di cua tre*.