Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
hanh vai » hanh vi, hanh va, hanh tai
lang van » dang van, tang van, hoang van
cac toc » cac toi, cac nuoc, cac thoi
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, va danh
cac lop » cac hop, cac loai
vai va » mai va, dai va, hai va
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sac ky ((nang xa) or (lang van)) hoi. hieu ve ((cac lop) or (cac toc)) va hanh vai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky ((nang xa) OR (lang van)) hoi. hieu ve ((cac lop) OR (cac toc)) va hanh vai va triet.
• Adding a wildcard symbol may retrieve word variants: te sac ky ((nang xa) or (lang van)) hoi. hieu ve ((cac lop) or (cac toc)) va hanh vai va triet*.