Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh dai » hanh tai, hanh dao, vanh dai
cua tre » cua te, cuu tre, dua tren
va hanh » van hanh, va thanh, va danh
cau luc » cau truc, cau phuc
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
dai hoi » dai hoc, dai hai, dai moi
tai hoe » tai he, tai khoa, thai hoc
hieu va » lieu va, hieu qua
va cau » van cau, va cac, va dau
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 ((tai hoe) or (dai hoi)). hieu va cau luc 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 ((tai hoe) OR (dai hoi)). hieu va cau luc va hanh dai ((cua tre) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: so sach ky nang ((tai hoe) or (dai hoi)). hieu va cau luc va hanh dai ((cua tre) or (cua triet))*.