Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
ban thanh » ban hanh, ban hang
cua triet » cua viet, su triet, va triet
ky tang » ky nang, ky dang, kho tang
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
cam duc » cam xuc, cao duc, nam duoc
su cao » cu cao, vu cao, su co

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su cao ky tang ((mai hoi) or (xa hoi)). hieu ve ((cam duc) OR (pham duc)) ban thanh dai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su cao ky tang ((mai hoi) OR (xa hoi)). hieu ve ((cam duc) OR (pham duc)) ban thanh dai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su cao ky tang ((mai hoi) or (xa hoi)). hieu ve ((cam duc) OR (pham duc)) ban thanh dai cua triet".
• Adding a wildcard symbol may retrieve word variants: su cao ky tang ((mai hoi) or (xa hoi)). hieu ve ((cam duc) OR (pham duc)) ban thanh dai cua triet*.