Perhaps you should try some spelling variations:
thanh toan » thanh hoa, thanh san, tinh toan
van thanh » ban thanh, van tuan
tu sach » thu sach, su sach, te sach
duc van » duc va, duc tan, duc manh
cua tre » cua te, cua triet, dua tren
van bao » van ban
cuu tre » cau tren, cau treo
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van 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 x hoi. hieu ((van bao) OR (van dao)) duc van thanh toan ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach v nang x hoi. hieu ((van bao) OR (van dao)) duc van thanh toan ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach v nang x hoi. hieu ((van bao) OR (van dao)) duc van thanh toan ((cua tre) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: tu sach v nang x hoi. hieu ((van bao) OR (van dao)) duc van thanh toan ((cua tre) or (cuu tre))*.