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