Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh hoi » thanh hoai, thanh hoa, thanh hai
hieu van » hieu va, thien van, lieu va
vu sach » vu bach, su sach, vu khach
cao duc » dao duc, cao suc, giao duc
cuu tre » cua tre, cau tren, cau treo
sach tu » sach thu, cach tu, sach ty
cam duc » cam xuc, pham duc, nam duoc
tu nang » tru nang, tu nong, tu nano
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: vu sach tu nang x hoi. hieu van ((cam duc) OR (cao duc)) ban thanh hoi ((cua te) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach tu nang x hoi. hieu van ((cam duc) OR (cao duc)) ban thanh hoi ((cua te) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach tu nang x hoi. hieu van ((cam duc) OR (cao duc)) ban thanh hoi ((cua te) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: vu sach tu nang x hoi. hieu van ((cam duc) OR (cao duc)) ban thanh hoi ((cua te) or (cuu tre))*.