Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
van thanh » ban thanh, van tuan
tu sach » thu sach, su sach, te sach
cao duc » dao duc, cao suc, giao duc
cam duc » cam xuc, pham duc, nam duoc
hieu ve » hieu va, hieu van
ho nang » thi nang, kha nang, cao nang
lo nang » ly nang, loai nang, cao nang
ma hoi » mai hoi, xa hoi, ma hoa
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: tu sach ((lo nang) OR (ho nang)) ma hoi. hieu ve ((cam duc) or (cao duc)) van thanh tai cuc te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((lo nang) OR (ho nang)) ma hoi. hieu ve ((cam duc) OR (cao duc)) van thanh tai cuc te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((lo nang) OR (ho nang)) ma hoi. hieu ve ((cam duc) or (cao duc)) van thanh tai cuc te".
• Adding a wildcard symbol may retrieve word variants: tu sach ((lo nang) OR (ho nang)) ma hoi. hieu ve ((cam duc) or (cao duc)) van thanh tai cuc te*.