Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh dai » hanh tai, hanh dao, vanh dai
hieu van » hieu va, thien van, lieu va
nang dai » nang dau, nang tai, lang dai
dai hoi » dai hoc, dai hai, dai moi
hieu ve » hieu va
sach ky » sac ky, sach y, sach ty
cam tuc » cam xuc, cam tu, nam thuc
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, dua tren
so sach » so sanh, bo sach, co sach
tuc va » thuc va, truc va, tuc xa

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