Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
tru nang » tra nang, tri nang, truc nano
cao duc » dao duc, cao suc, giao duc
su cach » su sach, tu cach, su cac
mai hoi » mai khoi, dai hoi, lai hoi
tu nang » tu nong, tu nano, tu lang
hieu va » lieu va, hieu qua
va cao » va cac, va co, va bao
va dan » ca dan, va dau, va dap
va dao » ca dao

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

• Performing a fuzzy search may retrieve terms with similar spellings: su cach ((tu nang) OR (tru nang)) mai hoi. hieu va cao duc ((va dan) or (va dao)) va su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su cach ((tu nang) OR (tru nang)) mai hoi. hieu va cao duc ((va dan) OR (va dao)) va su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su cach ((tu nang) OR (tru nang)) mai hoi. hieu va cao duc ((va dan) or (va dao)) va su triet".
• Adding a wildcard symbol may retrieve word variants: su cach ((tu nang) OR (tru nang)) mai hoi. hieu va cao duc ((va dan) or (va dao)) va su triet*.