Perhaps you should try some spelling variations:
thanh van » thanh san, thanh toan, thanh phan
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
van cam » van nam, van lam, van cau
dua ban » cua ban, qua ban, mua ban
van cua » vang cua, ban cua, dan cua
cua tre » cua te, cuu tre, cua triet
y lang » o lang, tay lang, yen lang
_ lang » o lang, _ land

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 ((y lang) OR (_ lang)) xa hoi. hieu van cam ((dua ban) or (dia ban)) thanh van cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((y lang) OR (_ lang)) xa hoi. hieu van cam ((dua ban) OR (dia ban)) thanh van cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((y lang) OR (_ lang)) xa hoi. hieu van cam ((dua ban) or (dia ban)) thanh van cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ((y lang) OR (_ lang)) xa hoi. hieu van cam ((dua ban) or (dia ban)) thanh van cua tre*.