Perhaps you should try some spelling variations:
thieu nien » thien nhien
cua triet » cua viet, su triet, va triet
hanh thai » nhanh thai, hinh thai, hanh tai
hieu vien » hieu hien, hieu viec, hieu tieng
thai cua » than cua, tai cuc, tri cua
van hanh » van thanh, ban hanh, van anh
duc van » duc va, duc tan, duc manh
cao duc » dao duc, cao suc, giao duc
tu ban » thu ban, te ban
nang o » nang co, nang ho, nang ro
tu san » thu san, tu can, vu san
o lai » o lao

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu ban) or (tu san)) ky nang o lai. ((hieu vien) or (thieu nien)) cao duc van hanh thai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu ban) OR (tu san)) ky nang o lai. ((hieu vien) OR (thieu nien)) cao duc van hanh thai cua triet.
• Adding a wildcard symbol may retrieve word variants: ((tu ban) or (tu san)) ky nang o lai. ((hieu vien) or (thieu nien)) cao duc van hanh thai cua triet*.