Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
ban thanh » ban hanh, ban hang
te sach » toc sach
cao duc » dao duc, cao suc, giao duc
ly vang » ly van, ly quang
ly hang » ly quang
hieu va » lieu va, hieu qua
cam duc » cam xuc, pham duc, nam duoc
cuc te » cua te, cuc thue, cuc tieu

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 ((ly vang) OR (ly hang)) xa hoi. hieu va ((cam duc) or (cao duc)) ban thanh tai cuc te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ly vang) OR (ly hang)) xa hoi. hieu va ((cam duc) OR (cao duc)) ban thanh tai cuc te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ly vang) OR (ly hang)) xa hoi. hieu va ((cam duc) or (cao duc)) ban thanh tai cuc te".
• Adding a wildcard symbol may retrieve word variants: te sach ((ly vang) OR (ly hang)) xa hoi. hieu va ((cam duc) or (cao duc)) ban thanh tai cuc te*.