Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh vai » hanh vi, hanh va, hanh tai
hieu van » thien van, lieu va, hieu ve
hieu va » lieu va, hieu qua
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
cam luc » cam xuc, cau luc
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
dai hoi » dai hoc, dai hai, dai moi
cai hoi » cau hoi, cai hoa, lai hoi
luc va » duc va, tuc va, loc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ky nang ((cai hoi) OR (dai hoi)). ((hieu van) or (hieu va)) cam luc va hanh vai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky nang ((cai hoi) OR (dai hoi)). ((hieu van) OR (hieu va)) cam luc va hanh vai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky nang ((cai hoi) OR (dai hoi)). ((hieu van) or (hieu va)) cam luc va hanh vai cua triet".
• Adding a wildcard symbol may retrieve word variants: so sach ky nang ((cai hoi) OR (dai hoi)). ((hieu van) or (hieu va)) cam luc va hanh vai cua triet*.