Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thanh hoa » thanh pho
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
cam duc » cam xuc, pham duc, nam duoc
hoa cua » hoa chat, hoa xuat
cao duc » dao duc, cao suc, giao duc
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
mai hoi » mai khoi, dai hoi, lai hoi
ma hoi » xa hoi, ma hoa, me hoi

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 ky nang ((ma hoi) OR (mai hoi)). hieu van ((cam duc) or (cao duc)) ban thanh hoa cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((ma hoi) OR (mai hoi)). hieu van ((cam duc) OR (cao duc)) ban thanh hoa cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ((ma hoi) OR (mai hoi)). hieu van ((cam duc) or (cao duc)) ban thanh hoa cua triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((ma hoi) OR (mai hoi)). hieu van ((cam duc) or (cao duc)) ban thanh hoa cua triet*.