Perhaps you should try some spelling variations:
sach tranh » canh tranh
sach tren » sach tien
hieu van » hieu va, thien van, lieu va
cac quoc » cac nuoc, cac cuoc, cao quoc
quoc ban » quoc bao, quoc lan, quoc quan
ban hanh » ban hang
nano xa » nano va, nano bac, nano cau
van cac » van hac, van cau, van bac
hanh di » hanh vi, hanh de, hang di
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.

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach tren) or (sach tranh)) nano xa hoi. hieu van cac quoc ban hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach tren) OR (sach tranh)) nano xa hoi. hieu van cac quoc ban hanh di cua tre.
• Adding a wildcard symbol may retrieve word variants: tu ((sach tren) or (sach tranh)) nano xa hoi. hieu van cac quoc ban hanh di cua tre*.