Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh lai » thanh hai, thanh lap, thanh loi
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
cam duc » cam xuc, cao duc, pham duc
dao duc » giao duc, tao duoc
lai cua » dai cua, hai cua, lai chau
y nang » ky nang, ly nang, v nang
nang o » nang co, nang ho, nang ro
cua te » cua tu
o hoi » co hoi, o hoc, o hai

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 nang o hoi. hieu van ((cam duc) or (dao duc)) ban thanh lai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y nang o hoi. hieu van ((cam duc) OR (dao duc)) ban thanh lai cua te.
• Adding a wildcard symbol may retrieve word variants: thu sach y nang o hoi. hieu van ((cam duc) or (dao duc)) ban thanh lai cua te*.