Perhaps you should try some spelling variations:
van triet » va triet, van thiet, van trieu
va hanh » van hanh, va thanh, va danh
te sach » toc sach
ve cai » va cai, ve tai, ve cau
y nang » ky nang, ly nang, v nang
ve cac » va cac, vien cac
va cao » va cac, va co, va dao
luc va » duc va, tuc va, loc va
nang o » nang co, nang ho, nang ro
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach y nang o hoi. hieu ((((ve cai) or (ve cac))) or (va cao)) luc va hanh vi van triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang o hoi. hieu ((((ve cai) OR (ve cac))) OR (va cao)) luc va hanh vi van triet.
• Adding a wildcard symbol may retrieve word variants: te sach y nang o hoi. hieu ((((ve cai) or (ve cac))) or (va cao)) luc va hanh vi van triet*.