Perhaps you should try some spelling variations:
thanh toan » thanh hoa, thanh san, tinh toan
van thanh » ban thanh, van tuan
cua triet » cua viet, su triet, va triet
van nang » van quang, van dong, van dung
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
ban duc » ban duoc, van duc, ban dac
cuu tre » cua tre, cau tren, cau treo
duc van » duc va, duc tan, duc manh
v nang » va nang, vu nang, voi nang
x hoi » xa hoi, o hoi, x ho

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 ((v nang) OR (van nang)) x hoi. hieu van ban duc van thanh toan ((cua triet) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((v nang) OR (van nang)) x hoi. hieu van ban duc van thanh toan ((cua triet) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((v nang) OR (van nang)) x hoi. hieu van ban duc van thanh toan ((cua triet) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: tu sach ((v nang) OR (van nang)) x hoi. hieu van ban duc van thanh toan ((cua triet) or (cuu tre))*.