Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thanh hoa » thanh pho
va thanh » gia thanh, ban thanh, va tinh
mai khoi » mai khoa, tai khoa, cac khoi
cam duc » cam xuc, pham duc, nam duoc
hoa cua » hoa chat, hoa xuat
cao duc » dao duc, cao suc, giao duc
te sach » toc sach
mai hoi » dai hoi, lai hoi, mai doi
hieu va » lieu va, hieu qua
y nang » ky nang, ly nang, v nang

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