Perhaps you should try some spelling variations:
su triet » su viet, ve triet
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
cao xuc » cam xuc, cao duc, cao suc
hanh ki » hanh vi, hanh ky, hanh kien
xuc van » duc van, luc van, vuc van
su tien » su kien, su hien, tu tieng
sach tu » sach thu, cach tu, sach ty
hieu va » lieu va, hieu qua
lai hoa » dai hoa, loai hoc
lai hoi » dai hoi, lai roi, mai hoi
tu nang » tru nang, tu nong, tu nano
va cao » va cac, va co, va dao

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 tu nang ((lai hoi) OR (lai hoa)). hieu va cao xuc van hanh ki ((su triet) or (su tien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tu nang ((lai hoi) OR (lai hoa)). hieu va cao xuc van hanh ki ((su triet) OR (su tien)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach tu nang ((lai hoi) OR (lai hoa)). hieu va cao xuc van hanh ki ((su triet) or (su tien))".
• Adding a wildcard symbol may retrieve word variants: tu sach tu nang ((lai hoi) OR (lai hoa)). hieu va cao xuc van hanh ki ((su triet) or (su tien))*.