Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
xuc van » duc van, luc van, vuc van
cac xuc » cam xuc, cac nuoc, chat xuc
hieu ve » hieu va, hieu van
ve cac » va cac, vien cac
nang o » nang co, nang ho, nang ro
tu san » thu san, tu ban, tu can
tu bac » tu ban, tu cac, tu bat
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 bac) or (tu san)) ky nang o lai. hieu ve cac xuc van hanh ((tai cuc) or (tri cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu bac) OR (tu san)) ky nang o lai. hieu ve cac xuc van hanh ((tai cuc) OR (tri cua)) tre.
• Adding a wildcard symbol may retrieve word variants: ((tu bac) or (tu san)) ky nang o lai. hieu ve cac xuc van hanh ((tai cuc) or (tri cua)) tre*.