Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
thu sach » tu sach, thuat sach, thuoc sach
quoc ban » quoc bao, quoc lan, quoc quan
hieu van » hieu va, thien van, lieu va
lang van » dang van, tang van, hoang van
sach ky » sac ky, sach y, sach ty
van cam » van nam, van lam, van cau
duc van » duc va, duc tan, duc manh
lang xa » lang ha, dang xay
hai cua » thai cua, dai cua, hoi cua
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: thu sach ky ((lang xa) OR (lang van)) hoi. hieu van cam ((quoc ban) or (duc van)) thanh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky ((lang xa) OR (lang van)) hoi. hieu van cam ((quoc ban) OR (duc van)) thanh hai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky ((lang xa) OR (lang van)) hoi. hieu van cam ((quoc ban) or (duc van)) thanh hai cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ky ((lang xa) OR (lang van)) hoi. hieu van cam ((quoc ban) or (duc van)) thanh hai cua tre*.