Perhaps you should try some spelling variations:
vao triet » va triet, mao triet, va trien
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
van cau » van dau, van hau, van chat
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
v nang » va nang, vu nang, van nang
nang o » nang co, nang ho, nang ro
cau tu » dau tu, cau truc
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: ((tu cac) or (su sach)) v nang o hoi. hieu van cau tu va hanh di vao triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cac) OR (su sach)) v nang o hoi. hieu van cau tu va hanh di vao triet*.