Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh tai » thanh tai, hang tai, han tai
cac luc » cau luc, coc luc, cac nuoc
cua tre » cua te, cuu tre, dua tren
va hanh » van hanh, va thanh, va danh
hieu va » lieu va, hieu qua
dai hoi » dai hoc, dai hai, dai moi
tai hoe » tai he, tai khoa, thai hoc
sac ky » cac ky, sai ky
luc va » duc va, tuc va, loc va
so sac » so sach, so dac

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sac ky nang ((tai hoe) or (dai hoi)). hieu va cac luc va hanh tai ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sac ky nang ((tai hoe) OR (dai hoi)). hieu va cac luc va hanh tai ((cua tre) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: so sac ky nang ((tai hoe) or (dai hoi)). hieu va cac luc va hanh tai ((cua tre) or (cua triet))*.