Perhaps you should try some spelling variations:
sach tham » sach nha
hieu van » hieu va, thien van, lieu va
quoc ban » quoc bao, quoc lan, quoc quan
cuc ban » cua ban, cac ban, cuu ban
tu sach » thu sach, su sach, te sach
van cam » van nam, van lam, van cau
song xa » song cua
nong xa » dong xa, nong va, cong xay
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di 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 tham ((nong xa) or (song xa)) hoi. hieu van cam ((cuc ban) or (quoc ban)) hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tham ((nong xa) OR (song xa)) hoi. hieu van cam ((cuc ban) OR (quoc ban)) hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach tham ((nong xa) or (song xa)) hoi. hieu van cam ((cuc ban) or (quoc ban)) hanh vi cua tre*.