Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thanh van » thanh san, thanh toan, thanh phan
hieu van » hieu va, thien van, lieu va
thuc van » thuc vat, thuc dan, thuc va
cau thuc » cau truc, cuu thuc, can thuc
te sach » toc sach
van cua » vang cua, ban cua, dan cua
vu sach » vu bach, su sach, vu khach
van cau » van dau, van hau, van chat
cua te » cua tu
o hoi » co hoi, o hai, o hoa
o hoc » co hoc, mo hoc, so hoc

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (vu sach)) ky nang ((o hoi) or (o hoc)). hieu van cau thuc van thanh van cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (vu sach)) ky nang ((o hoi) OR (o hoc)). hieu van cau thuc van thanh van cua te.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (vu sach)) ky nang ((o hoi) or (o hoc)). hieu van cau thuc van thanh van cua te*.