Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
ban tai » van tai, han tai, ban thi
cao duc » dao duc, cao suc, giao duc
cam duc » cam xuc, pham duc, nam duoc
hieu ve » hieu va, hieu van
ly hang » ly quang
ly nang » ky nang, ly vang, ly quang
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 ((ly nang) or (ly hang)) ma hoi. hieu ve ((cam duc) or (cao duc)) van ban tai cuc te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ly nang) OR (ly hang)) ma hoi. hieu ve ((cam duc) OR (cao duc)) van ban tai cuc te.
• Adding a wildcard symbol may retrieve word variants: tu sach ((ly nang) or (ly hang)) ma hoi. hieu ve ((cam duc) or (cao duc)) van ban tai cuc te*.